Question: 9.29 In the article quoted in Exercise 9.28, a sample of 12 measurements on the tensile strength of steel bars resulted in a mean of

9.29 In the article quoted in Exercise 9.28, a sample of 12 measurements on the tensile strength of steel bars resulted in a mean of and a standard deviation of 38. Estimate the true mean tensile strength of bars of this size and type using a 95% confidence interval. List any assumptions you need to make.

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