TI-83 Plus Statistics 321
17. Press Í. RESID is stored in column 3 of the
stat list editor.
Press † repeatedly to examine the residuals.
Notice that the first three residuals are negative. They correspond to the
shortest pendulum string lengths in L1. The next five residuals are
positive, and three of the last four are negative. The latter correspond to
the longer string lengths in L1. Plotting the residuals will show this pattern
more clearly.
18. Press y , 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 d 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.