A civil engineer is analyzing the compressive strength of

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A civil engineer is analyzing the compressive strength of concrete. Compressive strength is approximately normally distributed with variance = 1000 psi2. It is desired to estimate the compressive strength with an error that is less than 14 psi at 95% confidence. What sample size is required? Round your answer up to the nearest whole number. The answer must be exact.

Reference no: EM13616902

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