The values listed below are waiting times​ (in minutes) of customers at two different banks. At Bank​ A, customers enter a single waiting line that feeds three teller windows. At Bank​ B, customers may enter any one of three different lines that have formed at three teller windows. Answer the following questions.   Bank A 6.3 6.6 6.7 6.8 7.1 7.3 7.5 7.9 7.9 7.9   Bank B 4.3 5.5 5.8 6.2 6.6 7.8 7.8 8.5 9.4 10.0     Construct a 90​% confidence interval for the population standard deviation

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