Texas Instruments TI-83 PLUS - Manual (Page 327)

TI-83 Plus Statistics 324
26. Press s . The regression line and the
scatter plot are displayed.
The new function y=.192x .522 appears to fit the data well. To get more
information, examine a residual plot.
27. Press o to display the Y= editor.
Press | Í to deselect Y 1
.
Press } Í to turn off plot 1. Press ~
Í to turn on plot 2.
Note: Step 19 defined plot 2 to plot residuals
(
RESID ) versus string length ( L 1
).
28. Press q
9 to select 9:ZoomStat from the
ZOOM
menu. The window variables are
adjusted automatically, and plot 2 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.