Biased Sampling

In statistics , sampling bias is a bias in which a sample is collected in such a way that some members of the intended population have a lower sampling probability than others. It results in a biased sample , a non-random sample [1] of a population (or non-human factors) in which all individuals, or instances, were not equally likely to have been selected. [2] If this is not accounted for, results can be erroneously attributed to the phenomenon under study rather than to the method of sampling .


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