Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Cluster sampling is a sampling technique used when "natural" groupings are evident in a statistical population. It is often used in marketing research. In this technique, the total population is divided into these groups (or clusters) and a sample of the groups is selected. Then the required information is collected from the elements within each selected group. This may be done for every element in these groups or a subsample of elements may be selected within each of these groups. The technique works best when most of the variation in the population is within the groups, not between them.

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