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A manufacturing firm wishes to control the number of workers absence from its factory. It conducts...

A manufacturing firm wishes to control the number of workers absence from its factory. It conducts a sample, measuring the number of workers absence from work in a day for a month (30 days). It finds that the sample mean of the number of workers absence from work is 22, with a sample standard deviation of 4. Construct a 95% confidence interval to estimate the true mean of the number of workers absence from work in a day.

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