Statistics 9-7
Plot the residuals, and predict how many buildings of 12 or more stories there
are in a city with a population of 300 thousand.
27. Press ( 6 ¸ to turn off Y1.
28. Press ), and change the Window variable
values to best show the residuals. Use the minimum
and maximum values of L4 (M10.31862745 and
10.74019608) as guidelines for setting YMIN and
YMAX.
29. Press , to plot the residuals.
+ marks each residual value.
30. Press y ãQUITä M to return to a clear Home
screen. Press y ãY-VARSä 1 to select Y1. Then
press £ 300 d Í.
The value of Y1 (the linear regression equation) for
X=300 (which represents 300 thousand city
population) is shown. Remember to round the
number mentally to an integer (13) to represent
whole buildings.