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6. Suppose that a random sample of 50 observations is selected from a population that is N(106, 144). The sample mean is calculated as 108.

6. Suppose that a random sample of 50 observations is selected from a population that is N(106, 144). The sample mean is calculated as 108. Test the hypothesis Ho : M = 106 against the alternative H1 : / > 106 at the 5% significance level

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