A linear model is fit to predict starting salaries (in thousands of dollars) of automotive technicians who either graduated from high school (X1 = 0) or technical college (X1 = 1). Additional predictors were two continuous measures-higher score is better-of their interpersonal skills (X2) and attention to detail (X3), as well as the interaction between graduation and attention to detail (X4 = X1X3). Suppose that the fit resulted in 0 = 58, 1 = 6, 2 = 0.5, 3 = 0.2, and 4 = 0.06. (a) What is the predicted starting salary for a technical college graduate with scores of 60 and 70 on the two personality measures, respectively? (b) All else held constant, at what interpersonal skill scores does a high-school graduate average salary exceed that of a technical college graduate? (c) If each measure only runs between 0 and 100, can we conclude that technical college graduates earn more, on average, than high school graduates? If no, restate the conclusion correctly