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R1.21: For a control chart to be effective in detecting special-cause variation, subgroups should be selected...

R1.21: For a control chart to be effective in detecting special-cause variation, subgroups should be selected in a way that makes each subgroup as homogeneous as possible and that gives the maximum opportunity for variation to occur between subgroups. This is the key idea of:

A. Common-cause variation

B. Rational subgroups

C. Kaizen

D. Process capability

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Answer #1

Answer: B.

In rational sub-groups, subgroups are selected in a way that makes each of them homogeneous. This gives maximum opportunity for detect variation from one subgroup to another. This is especially useful to detect special cause or non-random variations.

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