9-4 Statistics
After entering and sorting the data, define the STAT PLOTS and Window
variables; then perform a linear regression (aX + b).
10. Press y ¸ to display the STAT PLOTS screen.
11. Press 1 to display the PLOT1 screen. Move the
cursor to ON, if necessary, and press Í to turn
PLOT1 on. Leave TYPE as scatter plot (¼), XL
(independent list) as L1, YL (dependent list) as L2,
and Mark as ›.
12. Press ) to display the Window variables.
Enter the following values.
0 for XMIN
1000 for XMAX
100 for XSCL
L15 for YMIN
100 for YMAX
10 for YSCL
13. Press A 9 to display the STAT CALC menu.
14. Press 3 to select LINREG(aX+b), which is copied to
the Home screen. Press 2 ¢ b 2 £ ¸.
The least-squares linear regression is calculated; the
display shows the values for a (slope), b
(y-intercept), and r (correlation coefficient).