In Problem 14.5 on page 583, you used horsepower and weight to predict mileage (stored in ). Use the results from that problem.
a. At the 0.05 level of significance, determine whether each independent variable makes a significant contribution to the regression model. On the basis of these results, indicate the most appropriate regression model for this set of data.
b. Compute the coefficients of partial determination, r2y1.2, and r2y2.1, and interpret their meaning.