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The president of a large aircraft parts manufacturing company wants to estimate the average engineering experience...

The president of a large aircraft parts manufacturing company wants to estimate the average engineering experience in years of her employees. A preliminary study revealed a standard deviation of 3.5 years. Compute the sample size needed to be 95% confident that the population mean is within a 0.25 year.

A. 28

B. 174

C. 753

D. 221

Math   Statistics-And-Probability   
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