Question: Exercise 12-10 presents data on heat treating gears. (a) Test the regression model for significance of regression. Using 0.05, find the P-value for

Exercise 12-10 presents data on heat treating gears.

(a) Test the regression model for significance of regression.

Using 0.05, find the P-value for the test and draw conclusions.

(b) Evaluate the contribution of each regressor to the model using the t-test with 0.05.

(c) Fit a new model to the response PITCH using new regressors x1 SOAKTIME SOAKPCT and x2

DIFFTIME DIFFPCT.

(d) Test the model in part

(c) for significance of regression using 0.05. Also calculate the t-test for each regressor and draw conclusions.

(e) Estimate 2 for the model from part

(c) and compare this to the estimate of 2 for the model in part (a). Which estimate is smaller? Does this offer any insight regarding which model might be preferable?

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