Question: A factory has 1200 workers. A simple random sample of 100 of these had weekly salaries with a (sample) mean of 315 and a (sample)

A factory has 1200 workers. A simple random sample of 100 of these had weekly salaries with a (sample) mean of 315 and a (sample) standard deviation of 20. Calculate a 90% confidence interval for the mean weekly salary of all workers in the factory.

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