Question: A decision maker is interested in estimating the mean of a population based on a random sample. She wants the confidence level to be 90%

A decision maker is interested in estimating the mean of a population based on a random sample. She wants the confidence level to be 90% and the margin of error to be ± 0.30. She does not know what the population standard deviation is, so she has selected the following pilot sample:

Based on this pilot sample, how many more items must be sampled so that the decision maker can make the desired confidence interval estimate?

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