33. The district sales manager for a major supermarket chain is studying sales. He believes sales depend primarily on three factors: population density in thousands (X1), advertising budget in thousands (X2), and the number of competitors in the region (X3). A sample of 15 regions yielded a total variation of $84 820.38 and a residual variation of $55 218.07. What is the coefficient of multiple determination? a) 0.651 b) 0.86 c) 0.0243 d) 0.411 34. The district sales manager for a major supermarket chain is studying sales. He believes sales depend primarily on three factors: population density in thousands (X1), advertising budget in thousands (X2), and the number of competitors in the region (X3). After careful sampling and investigation he comes up with the following ANOVA table. Source DF MS Regression 3 62 20.667 5.43 Error 31 118 3.806 Total 34 180 The computed value of F is: a) 1.90 b) 16.29 c) 5.43 d) 1.53 35. A correlation matrix a) shows all simple coefficients of correlation. b) shows all possible net regression coefficients. c) shows the correlations that are positive. d) reports the multiple regression equation.