Texas Instruments TITANIUM TI-89 - Manual (Page 127)

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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.
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).
The round function ( 2 I 1 3)
ensures that results show an integer
number of buildings.
After calculating the first result, edit the
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