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There are 3000 households living in an urban sector, a researcher wants to make an estimate of the mean that is within $300 of the

There are 3000 households living in an urban sector, a researcher wants to make an estimate of the mean that is within $300 of the true mean, with a significance level of 5%. The researcher will use a sample standard deviation of $300 obtained from a previous survey. what size sample should be needed?

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