A statistics professor takes a random sample of 25 students who have taken a special statistics class.  He wants to test the null hypothesis that the grades of these students are, on average, less than or equal to those of the population of students who take the regular statistics test.  The mean grade for the population is 75.  The mean grade for the sample is 86 with a standard deviation of 10.  Using a significance level of .05, test the null hypothesis.

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