A civil engineer is analyzing the compressive strength of concrete. Compressive strength is normally distributed with ² = 1000 psi². A random sample of 12 sample specimens has a mean compressive strength of = 3210 psi. Round your answers to 1 decimal place. (a) Calculate the 95% two-sided confidence interval on the true mean compressive strength of concrete. SHS i i (b) Calculate the 99% two-sided confidence interval on the true mean compressive strength of concrete. Sus i i

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