HP 33s hp 33s_user's manual_English_E_HDPM20PIE56.pdf - Page 152
Curve Fitting., X, Nitrogen Applied, Y, Grain Yield, Five data pairs entered.
UPC - 082916001456
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To find an estimated value for x (or y), key in a given hypothetical value for y (or x), then press | { ºˆ } (or | {¸ˆ }). To find the values that define the line that best fits your data, press | followed by {T}, {P}, or {E}. 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: { c {´} 4.63 0 5.78 20 6.61 40 7.21 60 7.78 80 | {T} Display: ) ) ºˆ ¸ˆ T P E ) ºˆ ¸ˆ T P E ) ºˆ ¸ˆ T PE ) Description: Clears all previous statistical data. Enters data; displays n. Five data pairs entered. Displays linear-regression menu. Correlation coefficient; data closely approximate a straight line. Slope of the line. y-intercept. 11-8 Statistical Operations