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Cluster sampling is the sampling methods, where different groups within a population is used as a template. This is different from sampling in which you will use the entire groups or clusters, as a model rather than a random selection of members of all groups. cluster sampling is a technique in which clusters of participants representing a population to be identified and included in the sample. Clusters of related groups of participants that represent a population are identified and included in the sample, this is common in the implementation of marketing research.For example, in some studies the problems of middle-class working people in a State, the first stage would be to pick up a number of districts in the city, the next stage will be to pick up a couple of rural and urban areas at random to study , In the third stage, a few families in the middle class will be collecting, last stage will have the choice of working couples in the family.
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