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The yield of a chemical process follows a normal distribution. We have a sample with n = 51 and s = 0.37. a) Test the hypothesis H0 : = 0.25 versus H1 : 6= 0.25 using = 0.05. Make your conclusion, by finding the P-value. b) Explain how you could answer the question in part (a) by constructing a 95% two-sided confidence interval for .

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