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A researcher plans a survey on student satisfaction with campus dining. She needs a 95% confidence level, a margin of error of , and estimates the standard deviation is . Using the formula where , what is the minimum sample size (round to the nearest integer)?
A researcher plans a survey on student satisfaction with campus dining. She needs a 95% confidence level, a margin of error of , and estimates the standard deviation is . Using the formula where , what is the minimum sample size (round to the nearest integer)?