An instructor has three sections of basic statistics: 8:00 a.m., 10:00 a.m., and 1:30 p.m. Listed ?below are the grades on the first exam for each section. Assume that the distributions do not follow the normal probability distribution. At the .05 significance level, is there a difference in the distributions of scores?

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8 a.m. 1:30 p.m. 10 a.m. 68 59 67 84 59 69 63 75 75 78 62 76 78 70 79 77 76 83 88 80 86 71 86 87