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A bank manager wants to determine the average time a customer waits in a queue...

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Finance

A bank manager wants to determine the average time a customer waits in a queue before being served in her bank. She wants to be 95% sure that her estimate does not differ from the true time by more than a quarter of a minute (B = 0.25 minutes). Previous research has shown that the standard deviation is 3.5 minutes per customer. What is the required sample size?

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