HP 35s Scientific Calculator - Manual (Page 174)

12-8 Statistical Operations
L.R. (Linear Regression) Menu
To find an estimated value for x (or y), key in a given hypothetical value for y
(or x), then press  ( ) (or Õ ( ).
To find the values that define the line that best fits your data, press  
followed by , , or .
Example: Curve Fitting.
The yield of a new variety of rice depends on its rate of fertilization with nitrogen.
For the following data, determine the linear relationship: the correlation coefficient,
the slope, and the y–intercept.
Menu Key Description
Estimates (predicts) x for a given hypothetical value of y,
based on the line calculated to fit the data.
Estimates (predicts) y for a given hypothetical value of x,
based on the line calculated to fit the data.
 Correlation coefficient for the (x, y) data. The correlation
coefficient is a number in the range –1 through +1 that
measures how closely the calculated line fits the data.
 Slope of the calculated line.
 y–intercept of the calculated line.
X, Nitrogen Applied
(kg per hectare) 0.00 20.00 40.00 60.00 80.00
Y, Grain Yield
(metric tons per hectare) 4.63 5.78 6.61 7.21 7.78
Keys: Display: Description:
  () Clears all previous statistical
data.
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