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biased sample

   Also found in: Medical, Wikipedia 0.04 sec.
biased sample [¦bī·əst ′sam·pəl]
(statistics)
A sample obtained by a procedure that incorporates a systematic error introduced by taking items from a wrong population or by favoring some elements of a population.


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family planning providers with large adolescent caseloads, the high number of clinic refusals and survey administration failures may have resulted in a biased sample, meaning that the findings cannot be extrapolated to all minor females using such clinics.
For example, the studies have very small sample sizes, biased sample selection, or lack of control groups.
These 25 patients may represent a biased sample of the larger group of non-SARS patients.
 
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