At Samantha€™s Super Store the customer service area processes customer returns, answers customer questions and provides information, addresses customer complaints, and sells gift certificates. The manager believes that if customers must wait longer than 8 minutes to see a customer service representative they get very irritated. The customer service process has been designed to achieve a customer wait time of between 6 and 12 minutes. The store manager has conducted 10 samples of five observations each of customer waiting time over a two-week period as follows:

Construct an -chart in conjunction with an R-chart to monitor customer service wait time, and comment on the capability of the service area to meet its designatedgoal.

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Sample9610.2 Wait Time (min 3.1 28 5.9 67 8 92 11.3 74 62 20.1 9.5 10.7 7.5 9.8 11.3 4.5 4.3 124 0.6 16.7 11.3 5.3 97 0.8 11.3 74 9.5 14.2 8.1 10.3 89 2 56 7.3 5.2 12.3 74 18.2 1 121 3.6 9.3 124 13.7 8.5 10 6.7 80 10.1 123