Question: Bank Waiting Lines The listed values are waiting times (in minutes) of customers at the Jefferson Valley Bank, where customers enter a single waiting line that feeds three teller windows. Test the claim that the standard deviation of waiting times is less than 1.9 mM, which is the standard deviation of waiting times at the same bank when sep-arate waiting lines are used at each teller window. Use a significance level of 0.05. Does the use of the single line appear to reduce the variation among waiting times? What is an advantage of reducing the variation among waiting times?

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