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Instruction: Please show the working in answering this question. Y O' 11 nict Question: A manufacturer of steel beams wants to estimate the average

Instruction: Please show the working in answering this question. Y O' 11 nict Question: A manufacturer of steel beams wants to estimate the average beam length to within 0.1 inches. How large a sample is needed for a 95% confidence interval if the population standard deviation of the beam lengths is known to be 0.6 inches?

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