Which of the following situations suggests a process that appears to be operating in a state of statistical control?
A) a control chart with a series of consecutive points that are above the center line and a series of consecutive points that are below the center line
B) a control chart in which no points fall outside either the upper control limit or the lower control limit and no patterns are present
C) a control chart in which several points fall outside the upper control limit
D) all of the above

Question

Quizplus · Accepted Answer

A process that appears to be operating in a state of statistical control is indicated by a control chart in which no points fall outside either the upper control limit or the lower control limit and no patterns are present. Option A suggests that the process is not in control because there are consecutive points above and below the center line, indicating lack of stability. Option C suggests that several points have fallen outside the upper control limit, indicating that there may be issues with the process. Hence, option B is the best choice.

Which of the Following Situations Suggests a Process That Appears