A cluster sampling is initiated by randomly selecting a digit, n, then selecting a sample element at every nth interval.

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Cluster sampling involves dividing the population into separate groups, known as clusters, and then a simple random sample of these clusters is selected. If all elements within selected clusters are surveyed, it is single-stage cluster sampling; if further sampling occurs within the clusters, it is multi-stage. The method described in the question refers to systematic sampling, not cluster sampling.

A Cluster Sampling Is Initiated by Randomly Selecting a Digit