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An electronics retailer is interested in studying the incomes of consumers in a particular area. The...

An electronics retailer is interested in studying the incomes of consumers in a particular area. The population standard deviation is known to be $1,000. What sample size would the researcher need to use for a 95% confidence if the margin of error should not be more than $50? What sample size would the researcher need to use for a 99% confidence if the margin of error should not be more than $60?

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