If data are obtained from samples and some of the sample means of the measurements are outside the control limits, the process is said to be
A) in control and the control limits need to be recalculated
B) in control with only natural causes of variation
C) out of control but with random variation
D) out of control and it should be investigated for assignable variation

Question

Quizplus · Accepted Answer

When sample means fall outside of the control limits, the process is considered out of control and should be investigated for assignable variation. This means that there are factors other than natural causes of variation that are contributing to the variation in the process. Recalculating the control limits or attributing the variation to random causes would not address the underlying issues causing the out-of-control situation.

If Data Are Obtained from Samples and Some of the Sample