Random sample

narrow selection of items that to each individual in the population there is an identical chance of belonging to

A sample is a subject chosen from a population for investigation. A random sample is one chosen by a method involving an unpredictable component. Random sampling can also refer to taking a number of independent observations from the same probability distribution, without involving any real population. A probability sample is one in which each item has a known probability of being in the sample.
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Noun
1. a sample in which every element in the population has an equal chance of being selected
(hypernym) sample distribution, sample, sampling
(classification) statistics
2. a sample grabbed at random
(hypernym) sample
(classification) statistics

Synonyms and related words:
accidentality, actuarial calculation, adjunct, adventitiousness, barometer, break, casualness, chance, component, contingent, cross section, destiny, detachment, detail, division, dole, fate, feeler, flukiness, fortuitousness, fortuity, fortune, fraction, gamble, good fortune, good luck, hap, happenstance, happy chance, heedless hap, how they fall, indeterminacy, indeterminateness, installment, item, law of averages, lot, luck, moira, opportunity, parcel, part, particular, percentage, pilot balloon, portion, principle of indeterminacy, probability, probe, problematicness, quadrant, quarter, quota, remainder, risk, run of luck, sample, sampling, section, sector, segment, serendipity, share, sound, sounder, statistical probability, straw vote, subdivision, subgroup, subspecies, the breaks, theory of probability, trial balloon, uncertainty, uncertainty principle, weather vane, weathercock, whatever comes
  

Random sample
(Econ) Mẫu ngẫu nhiên.+ Một mẫu mà tư cách của các thành viên được xác định bằng xác suất và là nơi một quan sát được thực hiện một cách độc lập đối với tất cả các quan sát khác ở mẫu này.
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