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].