8. 4 ( Data file . salarygov ) In Problem S. ` we modeled Maxsalary as the response and modeled the predictor Score using regressors from a B - spline basis to account for curvature . 8. 4.1 Asan alternative , show that the regression model Log ( Maxsalary ! - Score has an approximately linear mean function with approxi - mately constant variance . Most studies of salary and income are* done in log scale . 8. 4. 2 As in Problem 5.9.3, define a factor with two levels for male - and female - dominated job classes , and fit appropriate models to explore* differences between the two classes of jobs