Question: Consider the MPG data and multiple linear regression problem in Exercises 6-18 and 6-24. (a) Fit second-order polynomial models. (b) Check for multicolliearity in the

Consider the MPG data and multiple linear regression problem in Exercises 6-18 and 6-24.

(a) Fit second-order polynomial models.

(b) Check for multicolliearity in the data for each of the polynomial models. Comment on your results.

(c) Test the contribution of the second-order terms in the models when compared to the reduced first-order model.
Comment on your results.

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