SW # 5f Kruskal-Wallis H Test JBC Company wishes to purchase one of five different machines: A, B, C, D, E. In an experiment designed to determine whether there is a performance difference between the machines, five operators each work on the machines for equal times. Table below shows the number of units produced by each machine. A 68 72 77 42 53 B 72 53 63 53 48 60 82 64 75 72 48 61 57 64 50 E 64 65 70 68 53 Test the hypothesis that there is no difference between machines at the (a) 0.05, (b) 0.01 significance level