A random sample of 20 records of mean scores of the students in a test shows the following data: 90, 90, 93, 62, 60, 39, 72, 74, 82, 83, 69, 70, 87, 92, 91, 90, 86, 82, 73, and 79. At a 0.05 level of significance, can we reject the hypothesis that the mean score exceeds 72? Explain.

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