Question 568490
What is the minimum sample size needed in order for the union to be 95% confident that its estimate is within $0.35 of ? Suppose that the standard deviation of wages of foodservice workers in the U.S. is about $2.15 .
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n = [zs/E]^2
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n = [1.96*2.15/0.35]^2 = 145
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cheers,
Stan H.
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