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The mean (i.e., average) intelligence quotient (IQ) for all employeesof a big company at a certain age group is unknown. It is assumed that the

The mean (i.e., average) intelligence quotient (IQ) for all employeesof a big company at a certain age group is unknown. It is assumed that the population standard deviation of this group of people is 15. On the basis of a sample of20 employees, the mean IQ is found to be105.

What sample size would you recommend for estimating 95% CI of mean IQ with margin of error of 3?

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