Which chart should be interpreted first when both, x chart, and R chart are indicating a non-random behavior?

Which chart should be interpreted first when both, x chart, and R chart are indicating a non-random behavior? Correct Answer R chart

It is a property of control charts for x bar and R, that if they both indicate non-random behavior, and if R chart is interpreted first to delete the assignable causes in it, it will automatically delete assignable causes in x bar chart.

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