Question: I want to construct a 95% confidence interval on a population mean with a margin of error of no more than 3 units. If the

I want to construct a 95% confidence interval on a population mean with a margin of error of no more than 3 units. If the population standard deviation is known to be 7, what sample size would be needed for this problem?

A.	5
B.	20
C.	21
D.	10

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