Texas Instruments TI-89 Manual Book page 273

Steps
15. Display the Y= Editor. For
the MedMed regression
equation, set the display style to
.
Dot
Note: Depending on the previous
contents of your Y= Editor, you may
need to move the cursor to y1.
PLOTS 1 at the top of the screen
means that Plot 1 is selected.
Notice that y1(x) and y2(x) were
selected when the regression
equations were stored.
16. Scroll up to highlight Plot 1.
The displayed shorthand definition is
the same as on the Plot Setup screen.
17. Use ZoomData to graph Plot 1
and the regression equations
and .
y1(x) y2(x)
ZoomData examines the data for all
selected stat plots and adjusts the
viewing window to include all points.
18. Return to the current session of
the Data/Matrix Editor.
19. Enter a title for column 3. Define
column 3's header as the values
predicted by the MedMed line.
To enter a title, the cursor must
highlight the title cell at the very top of
the column.
† lets you define a header from
anywhere in a column. When the
cursor is on a header cell, pressing
† is not required.
20. Enter a title for column 4. Define
column 4's header as the
residuals (difference between
observed and predicted values)
for MedMed.
21. Enter a title for column 5. Define
column 5's header as the values
predicted by the LinReg line.
256 Chapter 16: Statistics and Data Plots
³
TI-89
Keystrokes
y1(x) ,
¥ #
2 ˆ 2
C
„ 9
O 6 1
B B C C
2 ™ M E D
j ¸
† Y 1 c j C
1 d ¸
B C 2 ™
R E S I D j
¸
j C 2 | j
C 3 ¸
B C C 2
™ L I N j
¸
† Y 2 c j
C 1 d ¸
›
TI-92 Plus
Keystrokes
¥ #
ˆ 2
C
„ 9
O 6 1
B B C C
M E D
¸
† Y 1 c C
1 d ¸
B C
R E S I D
¸
† C 2 |
C 3 ¸
B C
L I N
¸
† Y 2 c
C 1 d ¸
Display