Which of the following process results indicate that a statistical process is out of control?
A)A repeated series of small observations followed by large observations.
B)An increase in the standard deviation.
C)A slow and steady shift (up or down)in the process distribution mean.
D)All of these choices are true.

Question

Quizplus · Accepted Answer

All of these choices indicate that a statistical process is out of control. A repeated series of small observations followed by large observations is a sign of a non-random pattern in the data, which indicates that something has changed in the process. An increase in the standard deviation means that the variability of the process has increased, which is also a sign of an out-of-control process. A slow and steady shift in the process mean indicates that the process is drifting away from the target value, which is also a sign of an out-of-control process. Therefore, all of these indicators are useful for detecting an out-of-control process.

Which of the Following Process Results Indicate That a Statistical