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A researcher conducted a study on the job satisfaction of bus drivers in Detroit and selected a random sample of 121 drivers. If the average

A researcher conducted a study on the job satisfaction of bus drivers in Detroit and selected a random sample of 121 drivers. If the average score of this sample is 11.7 and the population standard deviation is 3.5, what is the estimate of the average job satisfaction score for all Detroit bus drivers at (a) the 95% confidence level and (b) the 99% confidence level?

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