Motorcycle Noise A recent study of 42 motorcycles found that the average noise pollution in decibels is 90. If the population standard deviation is 3.8 decibels, find the 93% confidence interval for the mean. Round answers to the nearest whole decibel. Round intermediate answers to two decimal places. We are 93% confident that the mean noise pollution level is between and motorcycles. decibels, based on a sample of 42

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