Texas Instruments PLUS TI-89 - Manual (Page 273)

256 Chapter 16: Statistics and Data Plots
16STATS.DOC TI-89/TI-92 Plus: Statistics and Data Plots (English) Susan Gullord Revised: 02/23/01 1:12 PM Printed: 02/23/01 2:17 PM Page 256 of 22
Steps
³
TI - 89
Keystrokes
›
TI - 92 Plus
Keystrokes Display
15. Display the Y= Editor. For y1(x) ,
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.
¥ #
2 ˆ 2 ¥ #
ˆ 2
16. Scroll up to highlight Plot 1.
The displayed shorthand definition is
the same as on the Plot Setup screen.
C C
17. Use ZoomData to graph Plot 1
and the regression equations
y1(x) and y2(x) .
ZoomData examines the data for all
selected stat plots and adjusts the
viewing window to include all points.
„ 9 „ 9
18. Return to the current session of
the Data/Matrix Editor.
O 6 1 O 6 1
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.
B B C C
2 ™ M E D
j ¸
† Y 1 c j C
1 d ¸ B B C C
M E D
¸
† Y 1 c C
1 d ¸
20. Enter a title for column 4. Define
column 4’s header as the
residuals (difference between
observed and predicted values)
for MedMed.
B C 2 ™
R E S I D j
¸
j C 2 | j
C 3 ¸ B C
R E S I D
¸
† C 2 |
C 3 ¸
21. Enter a title for column 5. Define
column 5’s header as the values
predicted by the LinReg line.
B C C 2
™ L I N j
¸
† Y 2 c j
C 1 d ¸ B C
L I N
¸
† Y 2 c
C 1 d ¸