Which of these is not one of the phenomenons likely to occur while the phase I application of SPC?

Which of these is not one of the phenomenons likely to occur while the phase I application of SPC? Correct Answer Process changing its state continuously between in-control and out-of-control

Shewhart control charts are used in phase I implementation of the SPC, where process is likely to be out-of-control, and experiencing assignable causes, which may result in large shifts in the monitored parameters.
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Related Questions

Which of these is a reason why the Shewhart control charts are not used in phase II application of SPC?
Which of these can be applied to Shewhart control charts to enhance their performance in the phase II application of the SPC?
Which of the control charts are used in phase I application of SPC?
One of the most significant phenomenons of our time has been the development of cinema.