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The Department of Labor would like to estimate the average weekly wages for US adults with a margin of error equal to $20. Determine the sample size needed to construct a confidence interval for this estimate using the following confidence levels. Assume the population standard deviation for the weekly average is $160.

a. 90%

b. 95%

c. 98%

d. Explain why the confidence level effects the sample size needed to obtain a particular margin of error?

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  • Category:- Physics
  • Reference No.:- M9786438

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