A quality control chart is used to monitor the customer wait time at a local call center. Sample means of five times are averaged and plotted over time. The last 50 sample means are randomly distributed between the upper and lower control limits. The process is ________.
A)out of control
B)in control
C)improving
D)showing assignable variation

Question

Quizplus · Accepted Answer

The fact that the last 50 sample means are randomly distributed between the control limits indicates that the process is in control, meaning that there is no evidence of any special cause variation affecting the customer wait time.

A Quality Control Chart Is Used to Monitor the Customer