For the Excel file Auto Survey, a. Find the best regression model to predict miles/ gallon as

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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 categorical variable Purchased to the model. Does this change your result?
c. Determine whether any significant interaction exists between Vehicle Age and Purchased variables.

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