12-6 Statistics
8312STAT.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 12:42 PM Printed: 02/19/01 1:37
PM Page 6 of 38
18.Press y [STAT PLOT] 2 to select 2:Plot2
from the STAT PLOTS menu. The stat
plot editor is displayed for plot 2.
19.Press Í to select On, which turns on
plot 2.
Press † Í to select " (scatter plot).
Press † y [L1] to specify Xlist:L1 for
plot 2. Press † [R] [E] [S] [I] [D]
(alpha-lock is on) to specify Ylist:RESID
for plot 2. Press † Í to select › as
the mark for each data point on the
scatter plot.
20.Press o to display the Y= editor.
Press | to move the cursor onto the
= sign, and then press Í to deselect
Y1. Press } Í to turn off plot 1.
21.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.
Notice the pattern of the residuals: a group of negative residuals, then a group
of positive residuals, and then another group of negative residuals.