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Show transcribed image text 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 μ to within 0.5 year with 99% confidence?
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 μ to within 0.5 year with 99% confidence?
