[Solution Library] A sample of 25 different payroll departments found that the employees worked an average of 310.3 days a year with a standard deviation of 23.8
Question: A sample of 25 different payroll departments found that the employees worked an average of 310.3 days a year with a standard deviation of 23.8 days. What is the 90% confidence interval for the average days worked, μ, of all payroll
departments?
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