Please Help!!!

Use the data under the "auto survey" tab to answer the following problem.

Gender Type Purchased Vehicle Age Mileage MPG

Male Mid-size Used 15 127233 28.7

Female Mid-size New 1 23970 43.4

Male Small New 7 77392 24

Female Large SUV Used 14 185397 15.2

Female Small New 2 26001 37

Female Minivan New 9 180643 20

Male Small Used 6 72083 45.7

Male Small New 11 165353 42

Male Small Used 13 205288 33

Female Small New 7 142897 31

Male Minivan Used 14 182584 12

Male Small SUV Used 13 140479 20

Female Small New 2 22114 28

Female Mid-size New 0.25 3454 28.3

Female Large SUV New 7 130905 21

Female Small Used 10 105628 35

Female Small New 5 48678 30.4

Male Mid-size New 0.5 6849 40.2

Female Small Used 10 137941 30

Female Small SUV New 4 29823 24.9

Male Small SUV Used 14 85763 21

Female Small Used 12 134172 31

Male Mid-size Used 12 86387 27

Problem #5 Part A: Find the best regression model to predict miles/gallon as a function of vehicle age and mileage.

Problem #5 Part B: Using your result from Part A, add the categorical variable for the vehicle type to the model. Does this change your result?