d. How can you explain the contradiction between the results in part (b) and part (c) above. Explanation e. Find 90% C.I. for the regression coefficient of Advertising Budget, and interpret this C.I. A 90% C.I. for the regression coefficient of Advertising Budget is Interpretation f. Based on your solution in part (e), can you conclude that the Advertising Budget is significant? Why? Is the Advertising Budget significant? (circle your answer) Yes No Justification g. Estimate the number of volumes sold for a book with each of the following given information and indicate which book the predicted value is for (X1, X2, ..., X8) = (204, 3, 30000, 50, 34000, 6, 1, 1) Which book? (Biology, Statistics, or Physics)? (X1, X2, ..., X8) = (204, 3, 30000, 50, 34000, 6, 0.5, 1) Which book? (Biology, Statistics, or Physics)? (X1, X2, ..., X8) = (204, 3, 30000, 50, 34000, 6, 1, 0) Which book? (Biology, Statistics, or Physics)