Texas Instruments Voyage 200 Manual

Copyright © 1999–2002 Texas Instruments Incorporated
ti
TI-89 / TI-92 Plus / Voyage™ 200
Statistics with List Editor
Important Information
Where to Find Installation Instructions
How to contact Support and Service
License Agreement
Table of Contents
The Statistics with List Editor application (Stats/List Editor) adds inferential
and more advanced statistics functionality to the TI-89 / TI-92 Plus /
Voyage™ 200 PLT through an easy-to-use list editor interface.
The Stats/List Editor is really two application in one. The list editor
provides a means for viewing, editing, and working with data lists. The
Statistics portion of the application provides basic inferential and
advanced statistics functionality. The two work together to let you view
and perform statistical analyses on data lists.

Important Information
Texas Instruments makes no warranty, either expressed or implied, including but not
limited to any implied warranties of merchantability and fitness for a particular purpose,
regarding any programs or book materials and makes such materials available solely on
an “as-is” basis.
In no event shall Texas Instruments be liable to anyone for special, collateral, incidental,
or consequential damages in connection with or arising out of the purchase or use of
these materials, and the sole and exclusive liability of Texas Instruments, regardless of
the form of action, shall not exceed the purchase price of this product. Moreover, Texas
Instruments shall not be liable for any claim of any kind whatsoever against the use of
these materials by any other party.
This graphing product application (APP) is licensed. See the terms of the license
agreement.
Where to Find Installation Instructions
You can find detailed instructions on installing Flash applications at
education.ti.com/guides.
Texas Instruments (TI) Support and Service Information
For General Information
E-mail: [e-mail]
Phone: 1-800-TI-CARES (1-800-842-2737)
For U.S., Canada, Mexico, Puerto Rico, and Virgin Islands only
Home Page:education.ti.com
For Technical Questions
Phone: [phone]
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contact Texas Instruments Customer Support before returning a product for service.
All other customers: Refer to the leaflet enclosed with this product (hardware) or contact
your local Texas Instruments retailer/distributor.

End-User License Agreement
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TI-89 / TI-92 Plus / Voyage™ 200 PLT Statistics with List Editor App iv
Table of Contents
Getting Started: Read This First!
Running and Quitting Stats/List Editor................................................................................................2
Stats/List Editor CATALOG ..................................................................................................................3
Stats/List Editor Screens......................................................................................................................4
Example: Pendulum Lengths and Periods..........................................................................................5
Example: Entering the Data...........................................................................................................6
Example: Plotting the Data ............................................................................................................7
Example: Fitting a Line to the Data...............................................................................................8
Example: Producing a Scatter Plot of the Residuals ..................................................................9
Example: Producing a Power Regression..................................................................................11
Example: Producing Another Residual Plot with the New Data...............................................12
Example: Producing Magnitudes of the Residuals....................................................................13
Example: Making Predictions with the Model............................................................................14
Error Messages....................................................................................................................................15
List Editor
Using the List Editor............................................................................................................................18
Creating Lists.......................................................................................................................................20
Removing Lists....................................................................................................................................21
Editing a List Element.........................................................................................................................23
Formulas ..............................................................................................................................................24
ƒTools Menu
Setup Editor .........................................................................................................................................28
Copy and Paste....................................................................................................................................29
Clear a-z................................................................................................................................................30
Clear Editor ..........................................................................................................................................31
Format ..................................................................................................................................................32
About ....................................................................................................................................................33
„Plots Menu
Plot Setup.............................................................................................................................................36
Norm Prob Plot (Normal Probability Plot).........................................................................................38
PlotsOff (Plots Off) and FnOff (Functions Off)..................................................................................40
…List Menu
Introduction..........................................................................................................................................42
Names Menu ........................................................................................................................................43
Ops (Operations) Menu.......................................................................................................................44
Sort List.........................................................................................................................................45
Sort List, Adjust All.......................................................................................................................46
dim( ................................................................................................................................................47
Fill...................................................................................................................................................48
seq( ................................................................................................................................................49
cumSum( .......................................................................................................................................50
@List(..............................................................................................................................................51

TI-89 / TI-92 Plus / Voyage™ 200 PLT Statistics with List Editor App v
…List Menu (continued)
augment(........................................................................................................................................52
left(.................................................................................................................................................53
mid( ................................................................................................................................................54
right(...............................................................................................................................................55
Math Menu............................................................................................................................................56
min( ................................................................................................................................................57
max( ...............................................................................................................................................58
mean(.............................................................................................................................................59
median(..........................................................................................................................................60
sum(...............................................................................................................................................61
product( .........................................................................................................................................62
stdDev(...........................................................................................................................................63
variance(........................................................................................................................................64
stDevPop(......................................................................................................................................65
varPop( ..........................................................................................................................................66
Attach List Formula.............................................................................................................................67
Delete Item ...........................................................................................................................................68
†Calc Menu
Introduction..........................................................................................................................................70
1.Var Stats (One-Variable Statistics).................................................................................................71
2.Var Stats (Two-Variable Statistics).................................................................................................73
Regressions Menu...............................................................................................................................76
LinReg(a+bx).................................................................................................................................77
LinReg(ax+b).................................................................................................................................79
MedMed .........................................................................................................................................81
QuadReg........................................................................................................................................83
CubicReg.......................................................................................................................................85
QuartReg .......................................................................................................................................87
LnReg.............................................................................................................................................89
ExpReg ..........................................................................................................................................91
PowerReg ......................................................................................................................................93
Logist83.........................................................................................................................................95
Logistic..........................................................................................................................................97
SinReg ...........................................................................................................................................99
MultReg........................................................................................................................................101
Probability Menu................................................................................................................................102
rand83(.........................................................................................................................................103
nPr(...............................................................................................................................................104
nCr( ..............................................................................................................................................105
!(factorial) ...................................................................................................................................106
randInt( ........................................................................................................................................107
.randNorm( ..................................................................................................................................108
randBin(.......................................................................................................................................109
randSamp(...................................................................................................................................110
rand(.............................................................................................................................................111
RandSeed ....................................................................................................................................112
CorrMat (Correlation Matrix).............................................................................................................113
Show Stats .........................................................................................................................................114

TI-89 / TI-92 Plus / Voyage™ 200 PLT Statistics with List Editor App vi
‡Distr (Distribution) Menu
Shade Menu .......................................................................................................................................116
Shade Normal..............................................................................................................................117
Shade t.........................................................................................................................................118
Shade Chi-square.......................................................................................................................119
Shade F........................................................................................................................................120
Inverse Menu......................................................................................................................................121
Inverse Normal............................................................................................................................122
Inverse t.......................................................................................................................................123
Inverse Chi-square .....................................................................................................................124
Inverse F......................................................................................................................................125
Normal Pdf .........................................................................................................................................126
Normal Cdf .........................................................................................................................................128
tPdf.....................................................................................................................................................129
t Cdf ....................................................................................................................................................131
Chi-square Pdf...................................................................................................................................132
Chi-square Cdf...................................................................................................................................133
FPdf....................................................................................................................................................134
F Cdf ...................................................................................................................................................135
Binomial Pdf.......................................................................................................................................136
Binomial Cdf.......................................................................................................................................137
Poisson Pdf........................................................................................................................................137
Poisson Cdf........................................................................................................................................139
Geometric Pdf....................................................................................................................................140
Geometric Cdf....................................................................................................................................141
ˆTests Menu
Z-Test..................................................................................................................................................144
T-Test..................................................................................................................................................146
2-SampZTest......................................................................................................................................148
2-SampTTest......................................................................................................................................151
1-PropZTest........................................................................................................................................154
2-PropZTest........................................................................................................................................156
Chi2 GOF............................................................................................................................................158
Chi2 2-way..........................................................................................................................................160
2-SampFTest......................................................................................................................................163
LinRegTTest.......................................................................................................................................165
MultRegTests.....................................................................................................................................168
ANOVA................................................................................................................................................171
ANOVA2-Way.....................................................................................................................................173
‰Ints (Intervals) Menu
ZInterval..............................................................................................................................................178
TInterval..............................................................................................................................................180
2-SampZInt.........................................................................................................................................182
2-SampTInt.........................................................................................................................................184
1-PropZInt...........................................................................................................................................186
2-PropZInt...........................................................................................................................................188
LinRegTInt..........................................................................................................................................190
MultRegInt..........................................................................................................................................193

TI-89 / TI-92 Plus / Voyage™ 200 PLT Statistics with List Editor App Getting Started 1
Getting Started: Read This First!
Running and Quitting Stats/List Editor................................................................................................2
Stats/List Editor CATALOG ..................................................................................................................3
Stats/List Editor Screens......................................................................................................................4
Example: Pendulum Lengths and Periods..........................................................................................5
Example: Entering the Data...........................................................................................................6
Example: Plotting the Data ............................................................................................................7
Example: Fitting a Line to the Data...............................................................................................9
Example: Producing a Scatter Plot of the Residuals ................................................................10
Example: Producing a Power Regression..................................................................................12
Example: Producing Another Residual Plot with the New Data...............................................13
Example: Producing Magnitudes of the Residuals....................................................................14
Example: Making Predictions with the Model............................................................................15
Error Messages....................................................................................................................................16
The Statistics with List Editor Application (Stats/List Editor) for the TI-89 /
TI-92 Plus / oyage™ 200 PLT is two applications in one. Stats/List Editor
includes a list editor that provides a means for viewing, editing, and working
with statistical data in lists. Stats/List Editor also provides basic inferential
and advanced statistics functionality. The two work together to let you view
and perform statistical analyses on data lists.
Note: You must set your TI-89 / TI-92 Plus / Voyage 200 PLT to the AUTO or APPROXIMATE mode
when using the Stats/List Editor application.

TI-89 / TI-92 Plus / Voyage™ 200 PLT Statistics with List Editor App Getting Started 2
Running and Quitting Stats/List Editor
Running Stats/List Editor
After installing Stats/List Editor:
1. Press 9.
2. Highlight Stats/List Editor.
3. Press ¸. The Folder Selection for Statistics Application
dialog box appears.
4. Press Bto display the folders in the Select Current Folder
field. Highlight the main folder, and then press ¸
¸.
Note: The Select Current Folder option always displays the folder
names 1:main and 2:statvars, but it displays other folders only if
you have created them. The statvars folder is primarily used by
the Stats/List Editor Application. It is recommended that you use
the main folder, or a folder that you have created as your current
folder. Refer to your guidebook for more information on creating,
setting, and deleting folders.
5. Press ¸when you have selected or created a folder.
The list editor is displayed.
Quitting Stats/List Editor
To exit Stats/List Editor and return to the calculator Home screen:
¦Press - l.
¦Press Oand select another application.
Tip: Press 2ato toggle between applications.
Any lists or other variables that you or the application stored while using Stats/List Editor are
retained in memory. ariables that you created are stored in the current folder. ariables
generated by Stats/List Editor are stored in the STATVARS folder.
Tip: Press 2 ° from anywhere on the calculator to open the VAR-LINK [All] menu.

TI-89 / TI-92 Plus / Voyage™ 200 PLT Statistics with List Editor App Getting Started 3
Stats/List Editor CATALOG
Accessing the Flash Apps CATALOG
Most statistical capabilities provided by the Stats/List Editor Application are also
available for use from the Home screen and in programming.
Copy any function or instruction from the CATALOG (including the Flash Apps CATALOG)
and paste it into the entry line on the previous screen.
1. To access the Flash Apps CATALOG, press:
¦½ … (Flash Apps) for the TIL89
¦2 ½ …(Flash Apps) for the TI-92 Plus / oyage™ 200 PLT
The CATALOG with all Flash Apps functions is displayed.
2. Use the up and down arrow keys (C D) to move the cursor (ú) to the Stats/List
Editor function that you want to use.
3. Press ¸to paste the function or instruction to the entry line of previous
screenlist editor, Home screen, program, etc.
Tip: To find an item in the CATALOG quickly, press the first letter in the item name. (You do not have
to press jfirst.) The cursor (ú)moves to the first item that begins with that letter. Use Cand Dto
scroll the CATALOG until you find the item you are looking for.
Understanding the CATALOG Screen
To resolve duplicate name conflicts from other applications, the application name is
combined with the function name. When viewed in the Flash Apps CATALOG, the
application name follows the function namebinomCdf(...TIStat. When placed in the entry
line, the application name precedes the function nameTIStat.binomCdf(.
Flash Apps CATALOG with binomCdf( selected
List editor with binomCdf( pasted to entry line
Syntax
In the CATALOG, each function’s syntax (all arguments and punctuation needed to
execute the function) is included in the status line to help enter you enter the correct
arguments for the function. This is especially useful for programming.
Tip: Press ƒ(Help)from the CATALOG to view the selected syntax statement at a larger size.
Example: binomCdf
N,P[,LOW,UP]
Notes: Always separate arguments with commas. Arguments in brackets are optional.
Function name (binomCdf)
with application prefix
(TIStat). Enter arguments
here.
Status line containing
syntax for binomCdf
Function name
(binomCdf) with
application (TIStat)
identified
Status line containing
syntax for binomCdf
N = Number of trials
P = Probability of success
LOW = Lower limit
UP = Upper limit

TI-89 / TI-92 Plus / Voyage™ 200 PLT Statistics with List Editor App Getting Started 4
Stats/List Editor Screens
Understanding the Stats/List Editor Screens
The three primary screens used in Stats/List Editor are shown below.
Note: All the screens used in this documentation were taken from the TI-89 calculator. The screens
displayed on the TI-92 Plus / Voyage™ 200 PLT are similar.
list editor menus dialog boxes
From the list editor
screen, you can:
¦Store, display, and edit
statistical input data in
lists.
¦Perform statistical
analyses and store
results in output lists.
From menus you can
access various statistical
operations. For example,
the F4 Calc menu lets
you calculate:
¦One- or two-variable
statistics.
¦Several types of
regressions such as
exponential, linear, and
quadratic regressions.
In dialog boxes, you can
view:
¦Prompts for data input.
¦Data output of
statistical calculations.
¦System messages.
You begin most of the procedures found in this guidebook at the list editor screen, where
you execute instructions, perform statistical analyses, and view the results.

TI-89 / TI-92 Plus / Voyage™ 200 PLT Statistics with List Editor App Getting Started 5
Example: Pendulum Lengths and Periods
Problem Setup
This is a fast-paced introduction to solving problems with Stats/List Editor. Read the remaining
chapters for details.
A group of students is trying to determine the mathematical relationship between the length of
a pendulum and its period (one complete swing of a pendulum). The group makes a simple
pendulum from string and washers and then suspends it from the ceiling. They record the
pendulum’s period for each of 12 string lengths.
Length (cm) Time (sec)
6.5 .51
11 .68
13.2 .73
15 .79
18 .88
23.1 .99
24.4 1.01
26.6 1.08
30.5 1.13
34.3 1.26
37.6 1.28
41.5 1.32
List Editor Setup
1. Display the list editor screen.
2. If necessary, press zBand then select 1:Function to set
the FUNCTION graphing mode.
Press ¸to return to the list editor screen.
3. Press ƒ(Tools) and select 3:Setup Editor to display the
Setup Editor dialog box.
4. Press ¸to close the Setup Editor dialog box without
entering any list names in the Lists To View field.
This removes all lists from the list editor and restores the
list names list1 through list6 to columns 1through 6.
Note: Removing lists from the list editor does not delete them from
memory. However, clearing elements from lists does delete the
elements permanently from memory.
5. If elements are stored in either list1 or list2, clear them.
Move the rectangular cursor onto list1, and then press
‘B‘¸to clear list1 and list2.

TI-89 / TI-92 Plus / Voyage™ 200 PLT Statistics with List Editor App Getting Started 6
Example: Entering the Data
1. Use the arrow keys (A B C D) to move the rectangular
cursor to the first element in list1.
Press 6Ë5Íto store the first pendulum string length
(6.5 cm) in list1. The rectangular cursor moves to the next
row.
Repeat this step to enter each of the 12 string length
values.
Length (cm):
6.5
11
13.2
15
18
23.1
24.4
26.6
30.5
34.3
37.6
41.5
2. Use the arrow keys to move the rectangular cursor to the
first element in list2.
Press Ë51 Íto store the first time measurement (.51
sec) in list2 and to move the rectangular cursor to the next
row.
Repeat this step to enter each of the 12 time values.
Time (sec):
.51
.68
.73
.79
.88
.99
1.01
1.08
1.13
1.26
1.28
1.32

TI-89 / TI-92 Plus / Voyage™ 200 PLT Statistics with List Editor App Getting Started 7
Example: Plotting the Data
1. Press „(Plots) to display the F2 Plots menu.
2. From the F2 Plots menu:
¦Select 3:PlotsOff to turn off all plots.
¦Select 4:FnOff to turn off all Y = functions.
3. Press „(Plots). Select 1:Plot Setup to display the Plot Setup
dialog box.
Note: Your Plot Setup dialog box may not look exactly like the one
shown here.
4. Highlight Plot 1 and press ƒ(Define)to display the Define Plot 1
dialog box.
5. If Scatter is not displayed, press Band select 1:Scatter.
6. Press D.If Cross is not displayed, press Band select
2:Cross (+)for the type of mark used for each data point on
the scatter plot.
7. Press Dto move the cursor to the xfield. Then press
2°to display the VAR-LINK [All] menu.Highlight
list1 and press Íto paste list1 in the xvalue field.
Note:If the contents of the MAIN folder are not displayed, highlight
the MAIN folder and then press Bto expand it.
8. Press Dto move the cursor to the yvalue field. Then press
2°to display the VAR-LINK [All] menu again.
Highlight list2 and press Íto paste list2 in the yvalue
field.
9. Press Dto move the cursor to the Use Freq and Categories?
field. If NO is not displayed, press Band set Use Freq and
Categories? to NO.
10. Press Íto close the dialog box with changes saved.
Plot1 is selected.
Tip: The ¸key evaluates an expression, executes an instruction, or
selects a menu item. When using the input examples in this guidebook
you may need to press¸more than once in order to calculate the
results. Press ¸once to save your information, and then press ¸
again to close a dialog box.

TI-89 / TI-92 Plus / Voyage™ 200 PLT Statistics with List Editor App Getting Started 8
11. Press ‡(ZoomData) to make sure the entire plot may be
viewed in the calculator screen and to begin plotting the
data.
Tip: To return to the list editor after graphing an equation or plotting
data, press 2a.

TI-89 / TI-92 Plus / Voyage™ 200 PLT Statistics with List Editor App Getting Started 9
Example: Fitting a Line to the Data
Since the scatter plot of time-versus-length data appears to be approximately linear, fit a line to the
data.
1. Press 2ato return to the list editor.
2. Press †(Calc) and select 3:Regressions to display the
Regressions menu. Then select 1:LinReg(a+bx) to display
the LinReg(a+bx) input dialog box.
Note: This example shows all dialog boxes with no lists stored.
Your calculator screen may show prepopulated X List and Y List
fields.
3. Press 2°to display the VAR-LINK [All] menu.
Highlight list1 and press Íto specify list1 for the XList
field.
4. Press Dto move the cursor to the YList field. Press
2°to display the VAR-LINK [All] menu, highlight
list2, and press Íto specify list2 for the YList.
5. Press Dto move the cursor to the Store RegEqn to field and
press B. Highlight y1(x) and press Íto store the
regression equation (RegEqn) variable to the y1(x) equation
variable.
6. Leave Freq,Category List,and Include Categories at their
defaults, as shown in the LingReg(a+bx) dialog box to the
right.
7. Press Íto execute the linear regression LinReg(a+bx)
and display the results. The linear regression for the data
in list1 and list2 is calculated. alues for a,b, r2,and rare
displayed. The linear regression equation is stored in Y1.
8. Press Í.The residuals are calculated and stored
automatically in the resid list, which is then pasted in the
last column of the list editor.
Note: To prevent the resid list from being pasted to the end of the
list editor, press ƒ9:Format to display the FORMATS dialog box,
Change the Results->Editor setting to NO, and then press Í.
resid is stored in the STATVARS folder.
9. Press ¥ % to graph the data. The regression line and
the scatter plot are displayed.

TI-89 / TI-92 Plus / Voyage™ 200 PLT Statistics with List Editor App Getting Started 10
Example: Producing a Scatter Plot of the Residuals
The regression line appears to fit the central portion of the scatter plot well. However, a
residual plot may provide more information about this fit.
1. Press 2ato return to the list editor.
Use the arrow keys to move the cursor onto list3.
Press y/. An unnamed column is displayed in column
three, and the remaining lists shift to the right one
column. The Name= prompt is displayed in the entry line,
and alpha-lock is on.
2. Press …(List)and select 1:Names to display the VAR-LINK
[All] menu. Highlight the resid variable, which is stored in
the STATVARS folder.
Note: If the contents of the STATVARS folder are not displayed,
highlight the STATVARS folder and press Bto expand it. You can
then access resid.
3. Press Íto paste resid to the entry line.
Note: Notice the path name in the entry line. If you paste a variable
name that is not in the current folder, the variable’s path name is
pasted as well.
4. Press Í.resid is moved from the last column to column
three of the list editor.
Notice that the first three residuals are negative. They correspond to the shortest pendulum
string lengths in list1. The next five residuals are positive, and three of the last four are
negative. The latter correspond to the longer string lengths in list1. Plotting the residuals will
show this pattern more clearly.
5. Turn off all plots and functions.
¦Press „(Plots) and select 3:PlotsOff to turn off all plots.
¦Press „(Plots)and select 4:FnOff to turn off all
Y = functions.
6. Press „(Plots) and select 1:Plot Setup to display the Plot
Setup dialog box.

TI-89 / TI-92 Plus / Voyage™ 200 PLT Statistics with List Editor App Getting Started 11
Example: Producing a Scatter Plot of the Residuals (continued)
7. Highlight Plot2 and press ƒ(Define). The Define Plot 2 dialog
box is displayed.
8. If Scatter is not already selected, press Band select
1:Scatter.
9. Press D. If Box is not already selected, press Band select
1:Box to use the Box (è) mark for each data point on the
scatter plot.
10. Press Dto move the cursor to the xfield. Press 2
°to display the VAR-LINK [All] menu.Highlight list1
(in the MAIN folder) and press Íto specify list1 for the
xvalue field.
Note: If the contents of the MAIN folder are not displayed, highlight
the MAIN folder, and then press Bto expand it.
11. Press Dto move the cursor to the yfield. Press 2
°to display the VAR-LINK [All] menu. Highlight the
resid list variable (in the STATVARS folder).
Tip: If the MAIN folder is expanded, highlight MAIN, and then press
Ato collapse the folder. You then have easy access to the
STATVARS folder. Additionally, you can type a letter to scroll
through a list. If there are any variable names that start with that
letter, the cursor moves to highlight the first of those variable
names.
12. Press Íto specify the statvars/resid variable for the y
field.
Note: If you paste a variable name that is not in the current folder,
the variable’s pathname is pasted as well.
13. If necessary, press Dand set the Use Freq and Categories?
option to NO.
14. Press Íto close the dialog box with the changes saved.
Plot2 is selected.
15. Press ‡(ZoomData). The window variables are adjusted
automatically and Plot2 is displayed.
This is a scatter plot of the residuals.

TI-89 / TI-92 Plus / Voyage™ 200 PLT Statistics with List Editor App Getting Started 12
Example: Producing a Power Regression
Notice the pattern of the residuals: a group of negative residuals, then a group of positive
residuals, and then another group of negative residuals. The residual pattern indicates a
curvature associated with this data set for which the linear model did not account. The residual
plot emphasizes a downward curvature, so a model that curves down with the data would be
more accurate. Perhaps a function such as square root would fit. Try a power regression to fit a
function of the form y = a äxb.
1. Press 2ato return to the list editor.
2. Press „(Plots) and select 1:Plot Setup to display the
Plot Setup dialog box. Highlight Plot 1 and press †Ÿto
turn it on. Press D†Ÿto turn off Plot 2.
3. Press ‡(ZoomData). The window variables are adjusted
automatically, and the original scatter plot of time-versus-
length data (Plot1) is displayed.
4. Press 2ato return to the list editor.
5. Press †(Calc)and select 3:Regressions. Then select
9:PowerReg to display the PowerReg input dialog box. XList
and YList should be prepopulated with the correct lists
(list1 and list2) to calculate this power regression. (See
arguments as shown to the right.)
6. Press Íto close the dialog box and calculate the power
regression.
alues for a,b,r2, and rare displayed in the PowerReg
output dialog box. The power regression equation is stored
in Y1. Residuals for the power regression are calculated
and placed in the resid list. The previous contents of resid
are overwritten by the new data. Residuals associated
with the linear fit of the transformed data are calculated
and placed in the residt list.
7. Press Íto close the dialog box and return to the list
editor.
Note: If the Results->Editor option in the ƒ(Formats)dialog box
is set to ON,resid and residt are pasted to the end of the list
editor.
8. Press ¥s. The regression line and the scatter plot
are displayed.

TI-89 / TI-92 Plus / Voyage™ 200 PLT Statistics with List Editor App Getting Started 13
Example: Producing Another Residual Plot with the New Data
The new function y1=.192283 …x^.522498 appears to fit the data well. To get more information,
examine a residual plot.
1. Press 2ato return to the list editor.
2. Turn off all plots and functions.
¦Press „(Plots) and select 3:PlotsOff to turn off all plots.
¦Press „(Plots)and select 4:FnOff to turn off all
Y = functions.
3. Press „(Plots) and select 1:Plot Setup to display the Plot
Setup dialog box. Highlight Plot 2 and press †Ÿto select
it.
4. Press ‡(ZoomData). The window variables are adjusted
automatically, and Plot2 is displayed. This is a scatter plot
of the residuals.
The new residual plot shows that the residuals are random in sign, with the residuals
increasing in magnitude as the string length increases.

TI-89 / TI-92 Plus / Voyage™ 200 PLT Statistics with List Editor App Getting Started 14
Example: Producing Magnitudes of the Residuals
To see the magnitudes of the residuals, continue with these steps.
1. Press …(Trace).
2. Press Band Ato trace the data. Observe the values for y
at each point.
With this model, the largest positive residual is about .041 and the smallest negative
residual is about L.027. All other residuals are less than .02 in magnitude.