HP 15c - Manual (Page 55)

Section 4: Statistics Functions 55
Example: Find the y-intercept and slope of the linear approximation of the
data and compare to the plotted data on the graph below.
Keystrokes Display
´L 4.86
y-intercept of the line.
® 0.04
Slope of the line.
Linear Estimation and Correlation Coefficient
When you press ´j the linear estimate, ŷ, is placed in the X-register
and the correlation coefficient, r, is placed in the Y-register. To display r,
press ®
.