Why are nonrandom patterns of data considered to be justification for identifying variability as having an assignable

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Why are nonrandom patterns of data considered to be justification for identifying variability as having an assignable cause? How do these patterns relate to a data point being above or below the 3a control limit?
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Probability & Statistics For Engineers & Scientists

ISBN: 9780130415295

7th Edition

Authors: Ronald E. Walpole, Raymond H. Myers, Sharon L. Myers, Keying

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