?Bank Lines The Jefferson Valley Bank once had a separate customer waiting line at each
Chapter 8, Problem 14(choose chapter or problem)
Bank Lines The Jefferson Valley Bank once had a separate customer waiting line at each teller window, but it now has a single waiting line that feeds the teller windows as vacancies occur. The standard deviation of customer waiting times with the old multiple-line configuration was 1.8 min. Listed below is a simple random sample of waiting times (minutes) with the single waiting line. Use a 0.05 significance level to test the claim that with a single waiting line, the waiting times have a standard deviation less than 1.8 min. What improvement occurred when banks changed from multiple waiting lines to a single waiting line?
6.5 6.6 6.7 6.8 7.1 7.3 7.4 7.7 7.7 7.7
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