Question: Consider the MPG data and multiple linear regression model in Exercise 6-18. (a) Find the mean MPG given that the weight is 2650 and the

Consider the MPG data and multiple linear regression model in Exercise 6-18.

(a) Find the mean MPG given that the weight is 2650 and the horsepower is 120.

(b) Compute a 95% CI on this mean response.

(c) Compute a 95% PI on a future observation when the weight is 2650 and the horsepower is 120.

(d) What do you notice about the relative size of these two intervals?

Which is wider and why?

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