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Hospital Noise Levels Noise levels at various area urban hospitals were measured in decibels. The mean noise level in 169 ward areas was 58.1 decibels,

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Hospital Noise Levels Noise levels at various area urban hospitals were measured in decibels. The mean noise level in 169 ward areas was 58.1 decibels, and the population standard deviation is 4.6. Find the 99% confidence interval of the true mean. Round your answers to at least one decimal place.

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