Question: In Problem 2.4 you were asked to compute a 95% CI on mean gasoline prediction interval on mileage when the engine displacement x1 = 275

In Problem 2.4 you were asked to compute a 95% CI on mean gasoline prediction interval on mileage when the engine displacement x1 = 275 in. 3 Compare the lengths of these intervals to the lengths of the confi dence and prediction intervals from Problem 3.5 above. Does this tell you anything about the benefi ts of adding x6 to the model?

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