Confidence interval for the mean decibel level

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Reference no: EM1318883

Noise level tests were done on 50 new light rail vehicles. The results of the test gave a sample mean of 75 decibels and a sample standard deviation of 8 decibels. Find a 90% confidence interval for the mean decibel level µ for this type of transit vehicle.

Reference no: EM1318883

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