random sample
| Noun | 1. | random sample - a sample in which every element in the population has an equal chance of being selected |
| 2. | random sample - a sample grabbed at random |
| 单词 | random sample | ||||||
| 释义 | random sample
random samplerandom samplea SAMPLE from a parent population selected by ensuring that each member of that population has an equal chance of being selected. When this is observed the sample should have the same profile of features as the parent population, i.e. it should be a valid representation of it. Data collected by random sampling (assuming the sample is large enough) should reflect the parent population, but methods which are not random (e.g. QUOTA SAMPLING) cannot be relied on to do so. However, it is recognized that samples are not entirely accurate, thus account must be taken of SAMPLING ERROR.The methods used to achieve random selection may be based on random number tables or, more usually in social surveys, on systematic sampling, i.e. selecting individuals, households, etc. according to their position on a list, such as the ELECTORAL REGISTER, when a sample of every name at a fixed interval, say the tenth on the list, is made. See also PROBABILITY. random sampleran·dom sam·'plerandom sampleA population sample selected by a randomisation method designed to ensure that each subject or patient in a target group has an equal chance of being selected for the treatment arm of the study.random sampleStatistics A population sample derived by selecting individuals, such that each has the same probability of selection; a group of subjects selected in such a way that each member of the population from which the sample is derived has an equal or known chance–probability–of being chosen for the sample. See Sampling.ran·dom sam·ple(randŏm sampĕl)random sample
Words related to random sample
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