Determining Sample Size. In Exercises 1922, assume that

Chapter 7, Problem 21

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Determining Sample Size. In Exercises 1922, assume that each sample is a simplerandom sample obtained from a normally distributed population. Use Table 7-2 to findthe indicated sample size. Flight Delays You want to estimate the standard deviation of arrival delays forAmerican Airlines flights from Chicago to Miami. Find the minimum sample sizeneeded to be 95% confident that the sample standard deviation is within 5% of thepopulation standard deviation. A histogram of a sample of those arrival delays suggeststhat the distribution is skewed, not normal. How does the distribution affect the samplesize?

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