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You are interested in studying how long the COVID-19 virus can live on hard surfaces under...

You are interested in studying how long the COVID-19 virus can live on hard surfaces under laboratory conditions. You plan to collect data and make an approximate 95% confidence interval for population mean duration. Previous literature from National Institutes of Health suggests the standard deviation of duration might be s = 10 hours.

a. What is the critical value you should use to calculate required sample size for this interval?

b. What is the required sample size needed to obtain a margin of error of 1, assuming the standard deviation given above?

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