Problem 10.19

(This is a continuation of the fuel efficiency Example 10.2.)

(a) Using the computer output displayed in the Table 10.7 (and the result that x = 3.21, Sxx = 2.95), construct 95% confidence intervals for β0 and β1.

(b) Compute a 95% confidence interval for the mpg when the automobile weighs 2530 lbs.

(c) Compute a 95% prediction interval for the mpg Y of a 1992 Escort that also weighs 2530 lbs. Compare the predicted value to the actual value, which is 30 mpg.