Which of these statements, correctly describes the concept of rational subgroups?

Which of these statements, correctly describes the concept of rational subgroups? Correct Answer If assignable causes are present, the chances of difference between subgroups should be largest

Rational Subgroups concept says that, for subgroups, if assignable causes are present, the chances of differences between subgroups should be maximized, while the chance for differences due to these causes within a subgroup must be lowest.
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Related Questions

If the deployment of the cusum is extended to the case of averages of the rational subgroups where sample size n>1, what will be done?