(a) Test whether the variances of marks for the two cohorts are the same at the 5% significance level. (b) Test the hypothesis that the average mark in the exam for Cohort 1 students is the same as that for students of Cohort 2 at the 5% significance level. For this test, what is the p-value? (c) What does the p-value that you calculated in (b) indicate about the null hypothesis?

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