Solved: The service time in queues should not have a large variance, Basic Statistics

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The service time in queues should not have a large variance

Question: The service time in queues should not have a large variance; otherwise, the queue tends to build up. A bank regularly checks service time by its tellers to determine its variance. A random sample of 22 service times (in minutes) gives s² = 8. Give a 95% confidence interval for the variance of service time at the bank.

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Basic Statistics: The service time in queues should not have a large variance

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