Refer to the data of Exercise 11 9 a Use the regression
Refer to the data of Exercise 11.9.
a. Use the regression line of Exercise 11.10 to calculate predicted values for x 5 60, 80, 100, 120, and 140.
b. For which x- values are most of the actual y- values larger than the predicted y- values? For which x- values are most of the actual y- values smaller than the ­predicted y- values? What does this pattern indicate about whether there is a linear relation between the drill speed and the lifetime of the bit?
c. Suggest a transformation of the data to obtain a linear relation between the lifetime of the bit and the transformed values of the drill speed.
In exercise
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