(Step-by-Step) Noise levels at various area urban hospitals were measured in decibels. The mean of the noise levels in 105 corridors was 61.2 decibels, and
Question: Noise levels at various area urban hospitals were measured in decibels. The mean of the noise levels in 105 corridors was 61.2 decibels, and the standard deviation was 9.7. Find the 90% confidence interval of the true mean.
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Properties of the Standard Normal Distribution - MathCracker.com