Operation Manual

Chapter 12: Statistics 190
Setting Up Statistical Analyses
Using Lists to Store Data
Data for statistical analyses is stored in lists, which you can create and edit using the stat list editor. The
TI-84 Plus C has six list variables in memory, L1 through L6, to which you can store data for statistical
calculations. Also, you can store data to list names that you create (Chapter 11).
Setting Up a Statistical Analysis
To set up a statistical analysis, follow these steps. Read the chapter for details.
1. Enter the statistical data into one or more lists.
2. Plot the data.
3. Calculate the statistical variables or fit a model to the data.
4. Graph the regression equation for the plotted data.
5. Graph the residuals list for the given regression model.
Displaying the Stat List Editor
The stat list editor is a table where you can store, edit, and view up to 20 lists that are in memory. Also,
you can create list names from the stat list editor.
To display the stat list editor, press …, and then select
1:Edit from the STAT EDIT menu.
The top line displays list names.
L1 through L6 are stored in columns 1 through 6 after a memory reset.
The number of the current column is displayed in the top-right corner.
The bottom line is the entry line. All data entry occurs on this line. The characteristics of this line change
according to the current context.
The center area displays up to ten elements of up to five lists. In MathPrint™ mode, the number of
elements displayed will vary depending on the MathPrint™ templates used.
33. Press y [ to recall the Last Entry.
Press | | |
5 to change the string length to 50 cm.
34. Press Í to calculate the predicted time of about
1.48 seconds.
Since a string length of 50 cm exceeds the lengths in
the data set, and since residuals appear to be
increasing as string length increases, we would
expect more error with this estimate.
Note: You also can make predictions using the table
with the
TABLE SETUP settings Indpnt:Ask and
Depend:Auto (Chapter 7).