HP 35s HP 35s scientific calculator - User Guide - Page 174
Statistical Operations, L.R. Linear Regression Menu, Menu Key, Description, Display, Curve Fitting., X
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Menu Key ˆ ˆ L.R. (Linear Regression) Menu 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. To find an estimated value for x (or y), key in a given hypothetical value for y (or x), then press or 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. X, Nitrogen Applied (kg per hectare) Y, Grain Yield (metric tons per hectare) 0.00 4.63 20.00 40.00 60.00 80.00 5.78 6.61 7.21 7.78 Keys: () Display: Description: Clears all previous statistical data. 12-8 Statistical Operations