random sample

random sample
a subgroup of a total population (the so-called universe) selected by a random process ensuring that each member of the universe has an equal chance of being included in the sample. It is sometimes stratified so that separate samples are drawn from each of several layers of the universe, usually on the basis of age, sex, and social class. Selection is sometimes facilitated by identifying, in advance, groups of individuals (e.g. townships or neighbourhoods) whom it is deemed will together represent the whole (a so-called sampling frame).

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a sample chosen from a population in such a way that each choice is independent of the other choices and every member of the population has an equal probability of being chosen.

Medical dictionary. 2011.

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