Texas Instruments TI-89 Manual page 28

TI 89-28
Press
ENTER .
right appears on your screen. Press
again. If you have not entered
ENTER
the data in the correct location, press
. If you are ready to continue, press
[no]
or
1 [yes] ENTER .
Press
F1 [Choice?] 1 [first differences].
(Options 2 and 3 are used in the next
chapter of this Guide.)
The first differences are displayed.
Press
F1 [Choice?] 4 [Quit program].
To return to the home screen, press
or
F5 [PrgmIO]
If you need to scroll the list to see the
rest of the first differences or recall
them, enter
d1
•
The first differences are constant at 541, so a linear function gives a perfect fit to these tax
data.
Note: Program
spaced. First differences give no information about a possible linear fit to data with inputs that
are not the same distance apart. If you run program
spaced, the message
1.5.5 SCATTER PLOT SETUP The first time that you draw a graph of data, you need to set the
TI-89 to draw the type of graph you want to see. Once you do this, you never need to do this
set up again (unless for some reason the settings are changed). If you always put input data in
list and output data in list
c1
rather than the
Plot Setup
Access the data with
Press
[Current].
exactly like this one.)
On the
Plot Setup
Choose the options shown on the right. (You can
[Define].
choose any of the 5 available marks.) Type in
.
y
Press
ENTER
because there is a check mark to the left of the name. Press
to return to the data lists.
ENTER
The message on the
2
HOME .
in the entry line.
should not be used for data with input values (
DIFF
INPUT VALUES NOT EVENLY SPACED
, you can turn the scatter plots off and on from the
c2
screen after you perform this initial setup.
APPS 6 [Data/Matrix Editor]
(Your screen may not look
F2 [Plot Setup].
screen, have highlighted and press
Plot 1
to save the settings. Note that
c1
with input data that are not evenly
DIFF
appears and the program stops.
and choose
1
F1
for and for
c1 c2
x
is turned on
Plot 1
Copyright © Houghton Mifflin Company. All rights reserved.
Chapter 1
) that are not evenly
screen
Y=