Question: 5.6 Growing corn. Exercise 4.27 (page 85) gives data from an agricultural experiment. The purpose of the study was to see how the yield of

5.6 Growing corn. Exercise 4.27 (page 85) gives data from an agricultural experiment. The purpose of the study was to see how the yield of corn changes as we change the planting rate (plants per acre).

(a) Make a scatterplot of the data. (Use a scale of yields from 100 to 200 bushels per acre.)

Find the least-squares regression line for predicting yield from planting rate and add this line to your plot. Why should we not use the regression line for prediction in this setting?

(b) What is r^? What does this value say about the success of the regression line in pre dicting yield?

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