Texas Instruments TI-84 PLUS - Graphing Calculator Manual Book page 188

16. Press y 9 to display the
If necessary, press † to move the cursor onto the
list name .
RESID
17. Press Í to select
stat list editor's
Name=
18. Press Í.
RESID
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 . The next five residuals are positive, and three of the last four are negative. The latter
L1
correspond to the longer string lengths in
clearly.
19. Press y ,
menu. The stat plot editor is
STAT PLOTS
displayed for plot 2.
20. Press Í to select
Press † Í to select " (scatter plot). Press
† y d to specify
ä (alpha-lock is on) to specify
ã E ä ã S ä ã I ä ã D
for plot 2. Press † Í to select ›
Ylist:RESID
as the mark for each data point on the scatter plot.
21. Press o to display the Y= editor.
Press | to move the cursor onto the
then press Í to deselect
turn off plot 1.
22. Press q
to select
9
menu. The window variables are adjusted
automatically, and plot 2 is displayed. This is a
scatter plot of the residuals.
LIST NAMES
and paste it to the
RESID
prompt.
is stored in column 3 of the
. Plotting the residuals will show this pattern more
L1
to select from the
2 2:Plot2
, which turns on plot 2.
On
for plot 2. Press † ã
Xlist:L1
sign, and
=
. Press } Í to
Y1
from the
9:ZoomStat
menu.
R ä
ZOOM
Chapter 12: Statistics 181