Each Evening, a Nationwide Retail Chain Randomly Calls 100 of the Customers

Multiple Choice

Each evening, a nationwide retail chain randomly calls 100 of the customers who came to their store that day to ask whether they were satisfied with the service they had received. The customers respond yes or no. Suppose the company has found over time that 8 percent of the customers are not satisfied ("no" answers) , what is the 3-sigma upper and lower control limits for the appropriate control chart?

A) About .053 and .107
B) 0 to about .16
C) -.0.14 to about .16
D) About -1.96 to 1.96