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4 number of hours they worked is 43.9 hours per week . The standard deviation of the sample was Using a random sample of 20

4 number of hours they worked is 43.9 hours per week . The standard deviation of the sample was Using a random sample of 20 registered nurses in a hospital , a researcher found that the average found to be 1.98 . Find the 99 % confidence interval of the mean number of hours a nurse works

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