Question: Consider the gas mileage data in Exercise 12-7. Build regression models for the data from the numerical regressors using the following techniques: (a) All possible

Consider the gas mileage data in Exercise 12-7.

Build regression models for the data from the numerical regressors using the following techniques:

(a) All possible regressions.

(b) Stepwise regression.

(c) Forward selection.

(d) Backward elimination.

(e) Comment on the models obtained. Which model would you prefer? Why?

(f) Now construct indicator variable for trns and drv and add these to the list of regressors. Repeat the model building in the previous parts. Does your conclusion in part

(e) change?

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