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a survey will be conducted to gather salary information for an urban area. It is planned...

a survey will be conducted to gather salary information for an urban area. It is planned to block the factor of gender in the sampling. The tolerance of error is ± $5,000, salary distribution standard deviation is $20,000, how many employees need to be surveyed with 90% and 99% confidence respectively?

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Criven, os 20,000 Margin of Error is E= 5,000 At 90%. Confidence interval, critical value is Zn = 1.645 .. Number of employee

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