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1)Construct a 95% confidence interval estimate for the population mean given that s =30 , and...

1)Construct a 95% confidence interval estimate for the population mean given that s =30 , and n = 20.

2) A random sample of 81 workers at a company showed that they work an average of 100 hours per month with a standard deviation of 27 hours. At 95% confidence, how many more workers need to be included in the sample to provide a confidence interval with length 4 (i.e., the margin of error being 2)?

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