Texas Instruments TITANIUM TI-89 User Manual page 127

Steps and keystrokes
26. Display the
Y= Editor
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.
Press "
29. Use the MedMed (
LinReg ( ) regression equations to
y2(x)
calculate values for x = 300 (300,000
population).
function ( 2 I 1 3)
The
round
ensures 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 ¸
Previews
and turn all the
, not
3:Functions Off
to graph the residuals.
) and
y1(x)
to .
y1 y2
Display
y(x)
127