An electronics retailer is interested in studying the incomes of consumers in a particular area. The population standard deviation is known to be $8,000. a. What sample size would the researcher need to use for a 95% confidence if the margin of error should not be more than $600? b. What sample size would the researcher need to use for a 95% confidence if the margin of error should not be more than $800?
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96) σ = population standard deviation E = margin of error Show more…
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