Texas Instruments TI-84 - Manual (Page 283)

Chapter 12: Statistics 280
The new function y=.192x
.522
appears to fit the data well. To get more information,
examine a residual plot.
25. Press
Í to calculate the power regression.
Values for a and b are displayed on the home
screen. The power regression equation is stored
in
Y1 . Residuals are calculated and stored
automatically in the list name RESID .
26. Press
s. The regression line and the scatter
plot are displayed.
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.