A sample of 12 measurements on the tensile strength of steel bars resulted in a mean of 585 N/mm^2 and a standard deviation of 38.

A sample of 12 measurements on the tensile strength of steel bars resulted in a mean of 585 N/mm^2 and a standard deviation of 38. Estimate the true mean tensile strength of bars of this size and tyoe using 90% confidence interval. List any assumptions you need to make. Given n=150, x(bar)=477N/mm^2, and s=13

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