Texas Instruments TI-89 Manual Book page 274

Steps
22. Enter a title for column 6. Define
column 6's header as the
residuals for LinReg.
23. Display the
Plot Setup
deselect Plot 1.
24. Highlight Plot 2 and define it as:
Plot Type = Scatter
Mark = Box
x = C1
(MedMed residuals)
y = C4
25. Highlight Plot 3 and define it as:
Plot Type = Scatter
Mark = Plus
x = C1
(LinReg residuals)
y = C6
26. Display the Y= Editor and turn
all the functions off.
y(x)
From ‡ , select 3:Functions Off , not
1:All Off .
Plots 2 and 3 are still selected.
27. Use ZoomData to graph the
residuals.
› marks the MedMed residuals;
+ marks the LinReg residuals.
28. Display the Home screen.
29. Use the MedMed (
y1(x)
LinReg ( ) regression
y2(x)
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.
³
TI-89
Keystrokes
B C 2 ™
R E S I D j
¸
† j C 2 |
j C 5 ¸
„ †
screen and
D ƒ
D
D
C j 1 D
j C 4 ¸
¸
D ƒ
D
B 3 D
C j 1 D
j C 6 ¸
¸
¥ #
‡ 3
„ 9
"
2 I 1 3
) and
Y 1 c 3 0 0 d
b 0 d ¸
B
A A A A A
A A A 0 2
¸
›
TI-92 Plus
Keystrokes
B C
R E S I D
¸
† C 2 |
C 5 ¸
„ †
D ƒ
D
D
C 1 D
C 4 ¸
¸
D ƒ
D
B 3 D
C 1 D
C 6 ¸
¸
¥ #
‡ 3
„ 9
¥ "
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
¸
Chapter 16: Statistics and Data Plots
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