I did some research for a sporting goods store on golf clubs and balls. I selected two different clubs, one from Callaway and one from Maxfli, and two different balls, one from Callaway and one from Maxfli. For each of the four combinations of club and ball, I recruited 20 golfers and recorded their scores over 18 holes. Unfortunately, not all the golfers were able to finish the round, so some of the combinations only had 18 or 19 scores, instead of 20. The table below shows the sample sizes, the mean scores, and the total scores across golfers in each condition. You also know that EX²=671419. Test whether brand makes a difference for clubs or balls or if the brands of the club and ball interact using alpha=.05. Callaway club Maxfli club n=20 n=18 Callaway ball T=1783 T=1659 M=89.2 M=92.2 n=19 n=19 Maxfli ball T=1787 T=1902 M=94.1 M=100.1

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