Texas Instruments TI-89 Titanium Short User Manual page 82

Steps and keystrokes
24. Highlight
Plot 2
Plot Type = Scatter
Mark = Box
x = C1
(MedMed residuals)
y = C4
@ D , D D C j 1 D j C4 ¸
¸
25. Highlight
Plot 3
Plot Type = Scatter
Mark = Plus
x = C1
(LinReg residuals)
y = C6
@ D , D B 3 D C j 1 D j C6
¸ ¸
26. Display the
functions off.
From ‡, select
.
1:All Off
Plots 2 and 3 are still selected.
Press 8 # ‡ 3
27. Use
ZoomData
› marks the MedMed residuals;
+ marks the LinReg residuals.
Press „ 9
28. Display the Home screen.
@
"
29. Use the MedMed (
regression equations to calculate values for
x = 300 (300,000 population).
The
round
that results show an integer number of
buildings.
After calculating the first result, edit the
entry line to change
Press 2 I 1 3 Y1 c 300 d b 0 d
¸ B A (eight times) 0 2 ¸
76
and define it as:
and define it as:
and turn all the
Y= Editor
3:Functions Off
to graph the residuals.
) and LinReg (
y1(x)
function (2 I 1 3) ensures
to
y1
y(x)
, not
y2(x)
.
y2
Display
)
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