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A sample of 250 workers aged 16 and older produced an average length of time with the current employer (job tenure) of 4.4 years with

A sample of 250 workers aged 16 and older produced an average length of time with the current employer ("job tenure") of 4.4 years with standard deviation 3.8 years. Construct a 99.9% confidence interval for the mean job tenure of all workers aged 16 or older.

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