Texas Instruments TI-85 User Manual
Page 25
Chapter 1
B-25
Copyright © Houghton Mifflin Company. All rights reserved.
TI-85
It is possible to enter data while in the statis-
tics mode of your calculator. However, the examples
in this Guide assume that input data is already en-
tered in list
L
1
and output data is in list
L
2
.
Press
STAT
F1
(
CALC
) and press the
F
-keys on the
menu to enter
L
1
as the
xlist Name
and
L
2
as the
ylist Name
.
Press
ENTER
after each entry.
Choose the linear model with
F2
(
LINR
) .
The y-intercept,
a
, and the slope,
b
, of the model is
displayed along with the number,
n
, of data points.
(The
corr
that is shown is called the correlation
coefficient. It is something you will learn about in a
statistics course and should be ignored in this course.)
TI-86
Press
2nd
+
(
STAT
)
F1
(
CALC
)
F3
(
LinR
) .
To have the calculator find the linear model of best
fit using
L
1
as the input and
L
2
as the output
and
paste
the model into the
y(x)=
list, put the following after
the
LinReg
instruction:
The linear model fit by the TI-86
is of the form
y = a + bx
where a is the y-intercept and
b is the slope. This is equivalent,
but not of the same form, as the
model in your text.
the input and output list names either by typing them
from the keyboard or by pressing
2nd
–
(
LIST
)
F3
(
NAMES
), press the menu key under
L
1
, press
, and
press the menu key under
L
2
. Next, type
y1
. Press
ENTER
. (The model will be pasted into the location that
you specify.)
The linear model of best fit for the aligned tax data
entered in Section 1.4.4 of this Guide is displayed on
the home screen.
Note: It is not necessary to first clear any previously-
entered function from the location of the
y(x)=
list.
(The
corr
that is shown is called the correlation
coefficient. It is something you will learn about in a
statistics course and should be ignored in this course.)
Go the
y(x)=
list to verify
that the model has been
pasted into the
y
1
location.