=+30. Automobiles. An editor for a major automobile magazine has collected data on the best-selling cars in the US.

He is interested in the relationship between highway mileage and weight of the vehicles. Here are the regression and residual output, where the response variable is Mileage.

Dependent variable is: Mileage R-squared = 54.6%

s = 2.86 with 30 − 2 = 28 degrees of freedom Coefficients Standard Error t Stat P-value Intercept 46.32975 3.739023 12.39087 6.97E-13 Weight −0.00603 0.001039 −5.80626 3.09E-06 0

20 40 2000 3000 4000 5000 6000 Mileage Weight Mileage, Highway

–10

–5 0

5 0 20 40 Residuals Predicted Mileage Residuals Histogram 0

5 10 15

–5 –3 –1 1 3 5 More Frequency Residuals