You predicted the durability of a brand of running shoe, based on the forefoot shock-absorbing capability (FOREIMP) and the change in impact properties over time (MIDSOLE) for a sample of 15 pairs of shoes. Use the following results:

a. Construct a 95% confidence interval estimate of the population slope between durability and forefoot shock-absorbing capability.
b. 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 independent variables to include in this model.
For Information: Problem 14.3