Is the process stable? If not, in what weeks is it not stable? Answer: The process is stable.

The correct answer is A. The process is stable. Option A is correct because the process exhibits no special cause variation - all data points fall within the control limits and show no non-random patterns such as runs, trends, or clusters. A stable (or "in control") process means only common cause variation is present…

Control Phase

Question

Is the process stable? If not, in what weeks is it not stable? Answer:

The process is stable.

Options

AThe process is stable.

How the community answered

(37 responses)

A
100% (37)

Explanation

Option A is correct because the process exhibits no special cause variation - all data points fall within the control limits and show no non-random patterns such as runs, trends, or clusters. A stable (or "in control") process means only common cause variation is present, making the process predictable over time.

Since this question has only one answer choice, there are no distractors to eliminate - the question is testing whether you can recognize stability indicators rather than distinguish between competing claims.

Memory tip: Think "stable = no surprises" - if every week's data behaves randomly within the control limits and no week stands out as unusual, the process is stable. If even one week violates a control rule (e.g., a point outside the limits or 8 consecutive points on one side of the centerline), the process is not stable.

Topics

#process stability#control chart interpretation#out-of-control signals#SPC

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