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In Order to Estimate the Average Daily Down Time,a Manufacturer

Question 23

Multiple Choice

In order to estimate the average daily down time,a manufacturer randomly sampled 41 days of production records and found a mean of 51.75 minutes and standard deviation of 7.9 minutes.A 90% confidence interval for the population mean is:


A) 51.75 ± 4.76
B) 51.75 ± 3.28
C) 51.75 ± 2.08
D) 51.75 ± 1.30

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