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. Over the last hundred sample means,no sample means were outside a control limit. The chart shows ________.
A)chance variation
B)standard variation
C)assignable variation
D)total variation

Question

Quizplus · Accepted Answer

Since no sample means were outside a control limit, it indicates that the process is stable and the fluctuations are due to chance variation or random variation. Hence, the chart shows chance variation.

A Quality Control Chart Is Used to Monitor the Customer