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Question 7: Upper-tail test (15 points) Let u denote the true average duration of treating a disease by a certain therapy. Consider testing Ho: A

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Question 7: Upper-tail test (15 points) Let u denote the true average duration of treating a disease by a certain therapy. Consider testing Ho: A 20 days based on a sample of size n = 16 from a normal population with o = 9. The sample yields an average treatment duration of 21 days. Test this hypothesis at significance level a = 0.05

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