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Past experience indicates that the time required for high school seniors to complete a standarized test is a normal random variable with mean of 35

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Past experience indicates that the time required for high school seniors to complete a standarized test is a normal random variable with mean of 35 minutes. If a random sample of 20 high school seniors took an average 33.1 minutes with standard deviation of 4.3 minutes to complete this test, test the hypothesis Ho : M = 35 against H1 : M

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