Question: To test the hypothesis that the standard deviation on a standard test is 12, a sample of 40 randomly selected students exams was tested. The

To test the hypothesis that the standard deviation on a standard test is 12, a sample of 40 randomly selected students’ exams was tested. The sample variance was found to be 155. Does this sample provide sufficient evidence to show that the standard deviation differs from 12 at the 0.05 level of significance?

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