A bank must deploy a new service system. To provide faster service. Thus, the average time of a comparative study of the new system and existing system. Random customer waiting time to see a customer using the original system and the new system, each 100 system, found that the original system, customers must wait on average equal to 8.79 and variance equal to 4.7089 minutes, and new systems were found to be equal to the ลร่ย value and variance equal to 5.14 min 1.9044 minutes will bring a new system if the new system make customers get more than 3 min reo services, preaching help the Bank to decide whether or not the new system should be used. Define significance level equal to .03
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