Disproportionate stratified sampling is especially useful when the size of some of the subgroups in the population is relatively equal.

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Disproportionate stratified sampling is useful when some subgroups in the population are underrepresented and others are overrepresented. In this method, the sample size for each subgroup is disproportionate to its size in the population, allowing for a more efficient and effective sampling strategy.

Disproportionate Stratified Sampling Is Especially Useful When the Size of Some