A Seattle consumer agency believes that plumbers’ rates are too high and wants to estimate the mean hourly rate for all

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A Seattle consumer agency believes that plumbers’ rates are too high and wants to estimate the mean hourly rate for all

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A Seattle consumer agency believes that plumbers’ rates are toohigh and wants to estimate the mean hourly rate for all plumbers inSeattle. A random sample of 40 plumbers in the Seattle area showsthat the mean hourly rate charged by them is $33. The populationstandard deviation of hourly charges for all plumbers in Seattle is$15. Construct a 99% confidence interval for the mean hourlycharges for all plumbers in Seattle
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