A statistics professor is interested in whether there is any difference between the scores in the first-period statistics class and those in her third-period statistics class. She collects the information shown in the accompanying table. Use a rank-sum test to test at a 10 percent level whether the scores in the first-period class and those in the third-period class are different. Use the MINITAB program.

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Period 1 85 72 93 65 88 90 55 82 75 89 62 60 Period 3 84 93 87 80 55 95 75 72 76 88 80 75 Period 1 88 90 95 86 92 98 62 70 71 65 73 55 Period 3 95 88 64 63 68 70 71 67 85 90 72 77