The data below is from Problem 4. (Section 9.3) Miles Traveled, x Sales, y 5 30 6 32 13 10 11 18 6 14 77 61 64 60 47 54 119 SPSS Output: Model Summary Model Adjusted R Std. Error of the R R Square Square Estimate 6328 400 314 22.062 a. Predictors: (Constant), Miles a. Coefficient of Determination: b. What percent of the variation in sales can be explained by the number of miles a sales representative travels? Do you think the manager can accurately predict a sales representative's sales from C. the total number of miles he traveled? Explain. d. What other factors might influence a representative's sales