Question

21. A regression analysis between demand (y in 1000 units) and price (x in dollars) resulted in the following equation y-hat 9- 3x The above equation implies that if the price is increased by $1, the demand is expected to increase by 6 units decrease by 3 units decrease by 6,000 units decrease by 3,000 units a. c. d. 22. (12) An experimenter wishes to test if there is a significant difference in the average quality rating of wines from three different regions in Spain. He conducts an experiment and collects the following data x111.976 ni7 STrt 94.62 SSTotal 137.62 x2 :10.44 n,-9 x,-14.583 n,-12 Complete the following table DF MS Source 94.62 47.31 27.51 Trt 2 25 43 Error 27 137.62 23, what is the critical value used to reach a conclusion in problem 21? Assume a 5% level of significance a. 39.46 b. 3.39 C. 19.46 d. 2.052 24. Given the results shown, what conclusions would the researcher reach a. Fail to Reject HO because F> F(critical) There is no evidence that the average wine ratings in the 3 regions are statistically significant. statistically different from the others. from the average of region 1 b. Reject H(O) because F> F(critical).At least one of the regions average wine ratings is c. Reject H(O) because F> F(critical)L The mean rating in region2 is statistically different d. Can not make a determination. from information given

Answer 1

21 ) increased by 6 units

22) MS_error = 43/25 = 1.72

23) F_2,25 AT 0.05 = 3.39

24) OPTION B IS TRUE