Question

When a process is in a state of statistical control, all of the points on a control chart should fall within the control limits. However, it is undesirable that all of the points should fall extremely near, or exactly on, the centerline of the control chart. Why?

Answer 1

it is undesirable that all of the points should fall extremely near, or exactly on, the centerline of the control chart Because:

• It can make it difficult  to interpret patterns and draw conclusions in a run chart.
• It can lead hinder the process, and make it unstable.

When a data point falls outside the control limits of a run chart ?

If a data point falls is said to outside the control limits, we can say that the process is said to be out of one's control and it is good that an investigation is done to ascertain and remove the cause or causes.

So, it is undesirable that all of the points should fall extremely near, or exactly on, the centerline of the control chart Because:

• It can make it difficult  to interpret patterns and draw conclusions in a run chart.
• It can lead hinder the process, and make it unstable.

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