The customer service of a phone company is experimenting with two different systems. On Monday, they try the first system which is based on an automated menu system. On tuesday, they try the second system in which each caller is immediately connected with a live agent. A quality control manager selects a sample of seven calls each day. He records the time for each customer to have his or her question answered. The times (in minutes) are listed in the tables. A) Find the coefficient of variation for each of the two sets of data. B) Which data set is more consistent? Automated Menu Live agent 11.7 6.2 7.4 2.9 3.9 4.4 2.9 4.1 9.2 3.4 6.3 5.2 5.5 3.7

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.