Calculator User Manual

Chapter 12: Statistics 276
Since the scatter plot of time-versus-length data appears to be approximately linear, fit a
line to the data.
10. Press … ~
4 to select 4:LinReg(ax+b) (linear
regression model) from the
STAT CALC menu.
LinReg(ax+b) is pasted to the home screen.
11. Press y d ¢ y e ¢. Press  ~
1 to
display the
VARS Y-VARS FUNCTION secondary
menu, and then press
1 to select 1:Y1. L1, L2, and
Y1 are pasted to the home screen as arguments to
LinReg(ax+b).
12. Press Í to execute
LinReg(ax+b). The linear
regression for the data in
L1 and L2 is calculated.
Values for
a and b are displayed on the home
screen. The linear regression equation is stored in
Y1. Residuals are calculated and stored
automatically in the list name
RESID, which
becomes an item on the
LIST NAMES menu.
13. Press s. The regression line and the scatter
plot are displayed.