(See) In the hospital study cited in exercise 19, the mean noise level in the 171 ward areas was 58.0 decibels, and the population standard deviation is
Question: In the hospital study cited in exercise 19, the mean noise level in the 171 ward areas was 58.0 decibels, and the population standard deviation is 4.8. Find the 90% confidence interval of the true mean.
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