Consider again the data in Exercise 35 about the gas mileage and weights of cars.
In Exercise 35

a) Create a 95% confidence interval for the average fuel efficiency among cars weighing 2500 pounds, and explain what your interval means.
b) Create a 95% prediction interval for the gas mileage you might get driving your new 3450-pound SUV, and explain what that interval means.

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Variable Count Mean StdDev MPG Wt(1000s) 50 50 25.0200 4.83394 2.88780 0.511656 Dependent variable is MPG R-squared-75.6% s = 2.413 with 50-2 = 48 df Variable Coefficient SE(Coeff) t-Ratio P-Value Intercept 48.7393 1976 24.7 0.0001 Weight -821 36 0.674 -12.2 0.0001