Texas Instruments TI-89 ユーザーズマニュアル
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127
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.
Press
8 # ‡ 3
27. Use
ZoomData
to graph the residuals.
› marks the MedMed residuals;
+ marks the LinReg residuals.
+ marks the LinReg residuals.
Press
„ 9
28. Display the Home screen.
Press "
29. Use the MedMed (
y1(x)
) and
LinReg (
y2(x)
) regression equations to
calculate values for x = 300 (300,000
population).
population).
The
round
function (
2 I 1 3)
ensures that results show an integer
number of buildings.
number of buildings.
After calculating the first result, edit the
entry line to change
entry line to change
y1
to
y2
.
Press
2 I 1 3 Y1 c 300 d b 0 d
¸ B A (eight times) 0 2 ¸
Steps and keystrokes
Display