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