Texas Instruments TI-89 Manual page 32

TI 89-32
NOTE: Another way to tell the TI-89 the alignment formula is to have the cursor on any cell in
and press
c1 F4 [Header].
•
If you did not get the values
in the
ON Auto-calculate
Once the data have been aligned, clear the alignment definition
from the column header. To do this, have
press
ENTER
definition at the bottom of the screen. Press
WARNI NG: If you do not clear the alignment definition from the column header, the
feature will keep subtracting 1996 from the data every time you have
calculate
and is pressed.
ENTER
Find the linear function by pressing
(Calculation Type...)
and for . On the fourth line
c2
y
choose .
y 2 ( x )
Press
ENTER .
and see that the function has been
pasted in the chosen location. (Recall
that you can highlight the function
location and press
the complete function.)
Highlight the
y 1
turn off Press
.
y 1
function on the scatter plot of the data.
y 2 ( x )
If you now want to find the linear function that best fits the modified tax data using the input
data aligned another way, say as the number of years after 1900, first return to the data lists
with
APPS 6 [Data/Matrix Editor] 1 [Current]
Add 96 to each number currently in
with
alpha ) (c) 1 + 96.
The input now represents
ENTER .
the number of years since 1900. Press
F4 [Header] CLEAR ENTER .
•
The last step above was to clear the alignment definition once the data have been aligned.
Remember to do this or the input data may change without you realizing it when you
perform other calculations in the lists.
Type
alpha
0, 1, 2, 3, 4,
position. Press
(or press ) to highlight the alignment
F4 [Header]
F5 [Calc].
, press and
► 5 [LinReg].
(Store RegEQ to...)
Press
F1 (Y )
=
in order to see
►
line and uncheck the function with
F2 [Zoom] 9 [ZoomData]
c1
Press
−
and press
) (c) 1 1996
and in , press
5 c1 F1 [Tools] 9 [Format]
to return to the data editor.
ENTER
highlighted and
c1
CLEAR ENTER .
On the first line
Type in for
c1
x
, press and
►
to
F4 [ ]
b
to overdraw the
and highlight
c1.
Copyright © Houghton Mifflin Company. All rights reserved.
Chapter 1
ENTER .
and select
Auto-
highlighted
c1