desired information to be accurate within 0.68 decibels? Show all work. 1. A researcher is interested in estimating the noise levels in decibels at area urban hospitals. She wants to be 90% confident that her estimate is correct. If the standard deviation is 4.13, how large a sample is needed to get the (A) Find the mean and standard error of the distribution (B) Find P(x bar > 73.50) 2. Assume that the population of heights of male college students is approximately normally distributed with mean m of 73.63 inches and standard deviation s of 6.73 inches. A random sample of 97 heights is obtained. Show all work.

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