Question 4 The Klein Corporation's marketing department, using regression analysis estimates the firm's demand function, the result is as follow. Not yet Q = -104 - 2.1P + 3.21 + 1.5A + 1.67 answered Marked out of Where Q is the quantity demanded of the firm's product (in tons) and P is the price of the firm's product (in Ringgit per ton), I is the per capita income (in Ringgit), 1.00 A is the firm's advertising expenditures (in thousands of Ringgit) and Z is the price in (in Ringgit) of a competing product. The regression is based on 200 Flag question observation. R- = 0.89 and standard error of estimate = 108 (a) According to the computer printout, the probability is 0.005 that the t statistic for the regression coefficient of A would be as large (in absolute terms) as it is in this case if in fact A had no effect on Q. Interpret this result. (8 marks) (b) If 1=5000, A=20 and Z = 1000, what is the Klein Corporation demand curve? (6 marks) (c) If P=500 (and the condition in part b hold), estimate the quantity demanded of the Klein corporation's product? (6 marks) (d) How well does this regression equation fit the data