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Definitions for cluster sampling. Cluster sampling. Cluster sampling is a sampling technique used when natural but relatively homogeneous groupings are evident in a statistical population. It is often used in marketing research.
An alternative approach would be to take a random sample of 100 schools, and then take a random sample of ten school children from each of those schools. This is known as cluster sampling. In a sense, stratified sampling and cluster sampling are opposites of each other.