(Answered) Find the minimum sample size necessary to be 99 confident

Economics

Find the minimum sample size necessary to be 99% confident that the population mean is within 3 units of the sample mean given that the population standard deviation is 29.

(a) What is the critical value that corresponds to the given level of confidence? Round your answer to two decimals, and remember that critical values are always positive.

(b) What would be the minimum sample size needed? Round your answer up to the next integer.

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