biased sample

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biased sample

A subset of a population that does not represent—either intentionally or unintentionally—an entire population.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

biased sample

In epidemiology or medical research, a sample of a group that does not equally represent the members of the group.
See also: sample
Medical Dictionary, © 2009 Farlex and Partners