random-sample

random sampling

noun Statistics.
a method of selecting a sample (random sample) from a statistical population in such a way that every possible sample that could be selected has a predetermined probability of being selected.

Origin:
1895–1900

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
random sampling

noun
the selection of a random sample; each element of the population has an equal chance of been selected 
WordNet® 3.0, © 2006 by Princeton University.
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