Operation Manual
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.