Question: A control chart is used to determine whether or not a process is stable or has predictable performance. When a process is within acceptable limits,

A control chart is used to determine whether or not a process is stable or has predictable performance. When a process is within acceptable limits,

the process need not be adjusted. What are the upper and lower control limits usually set as?
A. + / - 3 sigma B. + / - 6 sigma C. + / - 2 sigma D. + / - 1 sigma

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