HP HP-11C

64 Section 3: Numeric Functions
Coal Production
(Billions of
Metric Tons)
20 +
1.9 4+
1.8 +
1.7 +
- ] ] ] ]
I I I
I
5.5 6.0 6.5 7.0
Electrical Output
(Billions of Megawatt Hours)
Keystrokes Display
(f] 0.7773 Y-intercept of the line.
0.1718 Slope of the line.
Retain the preceding statistical accumulations in your calculator
for use in the next example.
Linear Estimation and Correlation Coefficient
When you execute the function, the linear estimate (y) is placed
in the displayed X-register, and the correlation coefficient r is
placed in the Y-register.
Linear Estimation. With statistics accumulated in registers R
through R;, an estimated value for y (denoted y) can be calculated
by keying in a known value for x and pressing [f](j.r].