Question: 27. For the Excel file Auto Survey, a. Find the best regression model to predict miles/ gallon as a function of vehicle age and mileage.

27. For the Excel file Auto Survey,

a. Find the best regression model to predict miles/ gallon as a function of vehicle age and mileage.

b. Using your result from part (a), add the categori- cal variable Purchased to the model. Does this change your result?

c. Determine whether any significant interac- tion exists between Vehicle Age and Purchased variables.

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