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 deviationis 4.13, how large a sample is needed to get the desired information to be accurate within 0.68 decibels?

2. Assume that the population of heights of male college students is approximately normally distributed with meanm of 73.63 inches and standard deviation s of 6.73 inches. A random sampleof 97 heights is obtained.

(a) Find the mean and standard errorof the x bar distribution

(b) Find P(x bar > 73.50)

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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 desired information to be accurate within 0.68 decibels? Show all work.

Answer

The minimum sample size is given by the formula

Given that …

The statistical analysis for standard deviations are examined.