| 单词 | random sample |
| 释义 | > as lemmasrandom sample random sample n. Statistics a sample drawn from a population by a random process, each member of it having an equal chance of inclusion (sometimes contrasted with quota sample n. at quota n. Compounds 2). ΘΚΠ the world > action or operation > endeavour > trial or experiment > trial, test, or testing > [noun] > specific tests or testing > by sampling > at random > sample random sample1900 1900 Jrnl. Royal Statist. Soc. 63 450 The sequence of second differences in the new table suggests that the data may represent a random sample from a normal distribution. 1948 Tracts for Computers xxv. p. iii They may be regarded as fair random samples from a normal universe having a zero mean and a unit standard deviation. 1993 E. N. K. Clarkson Invertebr. Palaeontol. & Evol. (ed. 3) ii. 36/1 If a population is very small it will contain only a limited and random sample of the total genetic variability within the whole species. 2004 New Yorker 18 Oct. 89/1 The new breed of pollsters such as Gallup, Archibald Crossley, and Elmo Roper canvassed random samples of a few thousand in person rather than non-random millions through the mail. < as lemmas |
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