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TI-83 Plus Statistics 319
11. Press
y
d
¢
y
e
¢
. Press
~
1
to
display the
VARS Y
.
VARS FUNCTION
secondary
menu, and then press
1
to select
1:Y1
.
L1
,
L2
,
and
Y1
are pasted to the home screen as
arguments to
LinReg(ax+b)
.
12. Press
Í
to execute
LinReg(ax+b)
. The linear
regression for the data in
L1
and
L2
is calculated.
Values for
a
and
b
are displayed on the home
screen. The linear regression equation is stored
in
Y1
. Residuals are calculated and stored
automatically in the list name
RESID
, which
becomes an item on the
LIST NAMES
menu.
13. Press
s
. The regression line and the
scatter plot are displayed.
The regression line appears to fit the central portion of the scatter plot
well. However, a residual plot may provide more information about this
fit.
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