Question: Consider the automobile gasoline mileage data in Table B.3 . a. Build a linear regression model relating gasoline mileage y to engine displacement x1 and

Consider the automobile gasoline mileage data in Table B.3 .

a. Build a linear regression model relating gasoline mileage y to engine displacement x1 and the type of transmission x11 . Does the type of transmission signifi cantly affect the mileage performance?

b. Modify the model developed in part a to include an interaction between engine displacement and the type of transmission. What conclusions can you draw about the effect of the type of transmission on gasoline mileage?

Interpret the parameters in this model.

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