Employees in a large manufacturing plant worked an average of 62 hours of overtime last year, with a population standard deviation of 15 hours. Let x represents the number of overtime hours worked by employees last year. The z-score or the test statistic corresponding to a sample mean of 65 is
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The formula is: Z = (X - μ) / σ where: X = sample mean μ = population mean σ = population standard deviation Show more…
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