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

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To random sampling
Example sentences
Even with random sampling, people in the population have unequal probabilities
  of inclusion in the survey.
The bedrock on which the study is founded is the same as that on which opinion
  polls are built: random sampling.
What follows isn't a random sampling of movement opinion.
Random sampling ensures that monitoring data are unbiased and representative of
  the monitoring unit.
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