A Seattle consumer agency believes that plumbers' rates are too high and wants to estimate the mean hourly rate for all plumbers in Seattle. A random sample of 40 plumbers in the Seattle area shows that the mean hourly rate charged by them is $33. The population standard deviation of hourly charges for all plumbers in Seattle is $15. Construct a 99% confidence interval for the mean hourly charges for all plumbers in Seattle. O (26.891, 39.109) O (26.578, 39.422) O (28.352, 37.648) O (28.203, 37.797)

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