When clusters are of different sizes,as in the example of sampling college classes,researchers often use a method called selection interval.

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When clusters are of different sizes, researchers often use a method called stratified sampling to ensure that the sample accurately reflects the population. Cluster sampling involves dividing the population into clusters and then randomly selecting entire clusters. The method mentioned, selection interval, is more closely related to systematic sampling.

When Clusters Are of Different Sizes,as in the Example of Sampling