When using a control chart, a manager does not investigate the activity when
A) most observations are outside the preset range.
B) all observations are outside the preset range.
C) all observations are within the range of preset standard deviations.
D) most observations are within the range of 2 standard deviations.
E) all observations are determined to be non-random.

Question

Quizplus · Accepted Answer

If all observations are within the range of preset standard deviations, it means that the process is functioning normally without any major variations, and no further investigation is required. In this scenario, the process is considered to be under control. In contrast, options A and B indicate that significant variation is occurring in the process, which may require investigation to determine the cause of the variation. Option D indicates that some variation is occurring, but it is within an acceptable range. Option E suggests that non-random events are occurring, which may require investigation to identify potential sources of variation.

When Using a Control Chart, a Manager Does Not Investigate