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. 2013.
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WordNet
random sample

noun
1. a sample in which every element in the population has an equal chance of being selected 
2. a sample grabbed at random 
00:10
Random sample is always a great word to know.
So is quincunx. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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.
Cite This Source
Example sentences
Those who took the test in its early phase were volunteers rather than a random
  sample of undergraduates.
We intuitively know that facts gathered over time are a better random sample
  than any snapshot.
But they don't, they take a random sample of whales of all sizes because that
  is what you do when you are doing research.
The survey asks a random sample of recently discharged patients about important
  aspects of their hospital experience.
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