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4. A high-tech company wants to estimate the mean number of years of college education its employees have completed. A good estimate of the standard

4. A high-tech company wants to estimate the mean number of years of college education its employees have completed. A good estimate of the standard deviation for the number of the years of college is 1.0. How large a sample needs to be taken to estimate to within 0.5 year with 99% confidence?

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