Texas Instruments TI-82 STATS Manual Book page 208

Getting Started: Pendulum Lengths and Periods
The new function y=.192x
examine a residual plot.
27. Press o to display the
Press | Í to deselect
Press } Í to turn off plot 1. Press ~
Í to turn on plot 2.
Note: Step 19 defined plot 2 to plot residuals (
versus string length (
28. Press q
to select
9
menu. The window variables are
ZOOM
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.
To see the magnitudes of the residuals, continue with these steps.
29. Press r.
Press ~ and | to trace the data. Observe
the values for
Y
With this model, the largest positive residual
is about 0.041 and the smallest negative
residual is about L0.027. All other residuals
are less than 0.02 in magnitude.
12–8 Statistics
.522
appears to fit the data well. To get more information,
editor.
Y=
.
Y
1
L
).
1
9:ZoomStat
at each point.
RESID
)
from the
(cont.)