Texas Instruments TI-84 User Manual
Page 281
Chapter 12: Statistics
278
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
† ã
R
д
г
E
д
г
S
д
г
I
д
г
D
ä (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.