It is not possible for the x̄ chart to be out-of-control when the R chart is in control.

Name: It is not possible for the x̄ chart to be out-of-control when the R chart is in control.
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Question

Quizplus · Accepted Answer

It is possible for the x̄ chart to be out-of-control even when the R chart is in control. The two charts measure different aspects of the process variation, and one chart being in control does not guarantee the other chart is also in control.

It Is Not Possible for the X̄ Chart to Be