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 Y1.
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 (L1).
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.