Which of these is a reason why the Shewhart control charts are not used in phase II application of SPC?

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answerhappygod
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Which of these is a reason why the Shewhart control charts are not used in phase II application of SPC?

Post by answerhappygod »

a) Because they can count larger shifts in process
b) Because they can analyze information about the last sample observation
c) Because they become insensitive to lower order process shifts
d) Because they are impractical
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