A bank with branches located in a commercial district of a city and in a residential area has the business objective of developing an improved process for serving customers during the?noon-to-1 P.M. lunch period. Management decides to first study the waiting time in the current process. The waiting time is defined as the number of minutes that elapses from when the customer enters the line until he or she reaches the teller window. Data are collected from a random sample of 15 customers at each branch.

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