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Need some help on this one. I am unsure how to begin. Thanks! Hospital Noise Levels Noise levels at various area urban hospitals were measured

Need some help on this one. I am unsure how to begin. Thanks!
Hospital Noise Levels Noise levels at various area urban hospitals were measured in decibels. The mean noise level in 170 ward areas was 57.4 decibels, and the population standard deviation is 4.3. Find the 90% condence interval of the true mean. Round your answers to at least one decimal place. D

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