Student answers every question randomly
A multiple choice test has 15 questions, and each and every question has six answers to pick from. If student answers every question randomly, what would be the probability that she gets exactly two questions correct?
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For the samples summarized below, test the hypothesis that two variances are equal, at ? = 0.05
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Additionally, in sample of 225 students attending private four-year universities, only 20 students work at least 20 hours per week. Determine the test value for a test of the difference between these two population proportions?
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