Hospital Noise Levels Noise levels at various area urban hospitals were measured in decibels. The mean noise level in 167 ward areas was 51.2 decibels, and the population standard deviation is 5.5....

Extracted text: Hospital Noise Levels Noise levels at various area urban hospitals were measured in decibels. The mean noise level in 167 ward areas was 51.2 decibels, and the population standard deviation is 5.5. Find the 95% confidence interval of the true mean. Round your answers to at least one decimal place. O<>