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12-4 Statistics
8312STAT.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 12:42 PM Printed: 02/19/01 1:37
PM Page 4 of 38
Since the scatter plot of time-versus-length data appears to be approximately
linear, fit a line to the data.
10. Press
…
~
4 to select 4:LinReg(ax+b)
(linear regression model) from the
STAT
CALC
menu. LinReg(ax+b) is pasted to
the home screen.
11. Press
y
[
L1
]
¢
y
[
L2
]
¢
. Press
~
1 to display the
VARS Y
.
VARS
FUNCTION
secondary menu, and then
press
1 to select 1:Y
1
. L
1
, L
2
, and Y
1
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
L
1
and L
2
is calculated. Values for a and b are
displayed on the home screen. The linear
regression equation is stored in
Y
1
.
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.