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A visual representation of the sampling process. In statistics, quality assurance, and survey methodology, sampling is the selection of a subset or a statistical sample (termed sample for short) of individuals from within a statistical population to estimate characteristics of the whole population.
Sampling bias is usually classified as a subtype of selection bias, [7] sometimes specifically termed sample selection bias, [8] [9] [10] but some classify it as a separate type of bias. [11]