The stratified random sample is a subset of a frame, or of an associated population, chosen by randomly selecting one of the first k elements and then including every kth element thereafter until the desired sample size has been reached.

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Stratified random sampling involves dividing the population into subgroups (strata) based on shared characteristics and then randomly selecting a sample from each of these groups, not by selecting every kth element.

The Stratified Random Sample Is a Subset of a Frame