Solution: Exactly 84 corridors in urban hospitals were measured for noon-time noise levels. The mean of these noise levels was 61.2 decibels, while the
Question: Exactly 84 corridors in urban hospitals were measured for noon-time noise levels. The mean of these noise levels was 61.2 decibels, while the standard deviation was 7.9 decibels. Find the 95% confidence level (alpha = 2.5% or .025) of the true mean.
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F-test for the Equality of Two Population Variances - MathCracker.com