Exercise 11-7 presented gasoline mileage performance for 20 cars, along with information about the engine displacement. Find a 95% confidence interval on each of the following:
(a) Slope
(b) Intercept
(c) Mean highway gasoline mileage when the engine displacement is x = 150 in3
(d) Construct a 95% prediction interval on highway gasoline mileage when the engine displacement is x = 150 in3.