Texas Instruments PLUS TI-89 User Manual
Page 274
Chapter 16: Statistics and Data Plots 257
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 257 of 22
Steps
³
TI
-
89
Keystrokes
›
TI
-
92 Plus
Keystrokes
Display
22. Enter a title for column 6. Define
column 6’s header as the
residuals for LinReg.
B C 2 ™
R E S I D j
¸
† j C 2 |
j C 5 ¸
B C
R E S I D
¸
† C 2 |
C 5 ¸
23. Display the
Plot Setup
screen and
deselect Plot 1.
„ †
„ †
24. Highlight Plot 2 and define it as:
Plot Type = Scatter
Mark = Box
x = C1
y = C4
(MedMed residuals)
D ƒ
D
D
C j 1 D
j C 4 ¸
¸
D ƒ
D
D
C 1 D
C 4 ¸
¸
25. Highlight Plot 3 and define it as:
Plot Type = Scatter
Mark = Plus
x = C1
y = C6
(LinReg residuals)
D ƒ
D
B 3 D
C j 1 D
j C 6 ¸
¸
D ƒ
D
B 3 D
C 1 D
C 6 ¸
¸
26. Display the Y= Editor and turn
all the
y(x)
functions off.
From
‡
, select 3:Functions Off, not
1:All Off
.
Plots 2 and 3 are still selected.
¥ #
‡ 3
¥ #
‡ 3
27. Use
ZoomData
to graph the
residuals.
›
marks the MedMed residuals;
+
marks the LinReg residuals.
„ 9
„ 9
28. Display the Home screen.
"
¥ "
29. Use the MedMed (
y1(x)
) and
LinReg (
y2(x)
) regression
equations to calculate values for
x
=
300
(300,000 population).
The
round
function (
2 I
13)
ensures that results show an integer
number of buildings.
After calculating the first result, edit
the entry line to change y1 to y2.
2 I 1 3
Y 1 c 3 0 0 d
b 0 d ¸
B
A A A A A
A A A 0 2
¸
2 I 1 3
Y 1 c 3 0 0 d
b 0 d ¸
B
A A A A A
A A A 0 2
¸