Jamieson Inc. produces self-cleaning commercial ovens. In the testing phase of this capability, 20 tests were conducted on the prototype and the results show that 10 consecutive results show process variability that is below the given mean. Is this process in-control or out-of-control?

Question

Quizplus · Accepted Answer

This process is out-of-control.
Key Takeaway: A process is said to be out-of-control 8 or more data points lie consecutively on one side of the mean in the control chart. A process is also said to be out-of-control if one or more points fall outside the control limits (i.e. above the UCL or below the LCL).