Answer Happy

The management of the Diners Delight franchised restaurant chain is in the process of establishing quality-control charts for the time that its service people give to each customer. Management thinks the length of time that each customer is given should remain within certain limits to enhance service quality. A sample of six service people was selected, and the customer service they provided was observed four times. The activities that the service people were performing were identified, and the time to service one customer was recorded as noted below: Service Service Time (sec) Person Sample 1 200 120 83 68 110 102 Determine the upper control limit for an R-chart. 1 2 3 Sample 2 150 85 93 117 90 65 4 5 6 Sample 3 175 105 130 145 75 115 Sample 4 113 75 150 175 105 125