A random sample of noise levels in 24 operating rooms was taken, the mean noise

Question

A random sample of noise levels in 24 operating rooms was taken, the mean noise level for the 24 operating rooms was 41.6 decibels and a standard deviation of 7.5 decibels. Construct a 98 % confidence interval for the population mean mu. State the Margin of Error, Best Point Estimate and Include the written statement A researcher wishes to estimate within 2 points the average systolic blood pressure of female college students. If she wishes to be 94% confident, how large a sample should she select if the population standard deviation of female systolic blood pressure is 4.8?

Explanation / Answer

E=Za/2 * std.dev/sqrt(n)

Za/2 for 94% is 1.88

2= 1.88 * 4.8/sqrt(n)

sqrt(n) = 1.88*2.4

n = (4.5)2

rounding    n= 20

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