In an effort to increase public acceptance of a light rail system, the manager for City Transit
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In an effort to increase public acceptance of a light rail system, the manager for City Transit Services in Seattle is interested in estimating the standard deviation for the time it takes a bus to travel between the University of Washington and the downtown bus terminal. To develop an estimate for the standard deviation, he has collected a random sample of the times required for 15 trips. The sample standard deviation is 6.2 minutes. Based on these data, what is the 90% confidence interval estimate for the true population standard deviation?
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Related Book For 
Business Statistics A Decision Making Approach
ISBN: 9780136121015
8th Edition
Authors: David F. Groebner, Patrick W. Shannon, Phillip C. Fry, Kent D. Smith
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