Noun
a sample grabbed at random
a sample in which every element in the population has an equal chance of being selected
Source: WordNetNo technique of random sample has, so far as I can find, been developed in the United States or elsewhere, which can compare in accuracy or in economy with that described by Professor Mahalanobis. Prasanta Chandra Mahalanobis
Almost every sample in practice is biased because it is practically impossible to ensure a perfectly random sample. Source: Internet
A statistic is a random variable that is a function of the random sample, but not a function of unknown parameters. Source: Internet
It can produce a weighted mean that has less variability than the arithmetic mean of a simple random sample of the population. Source: Internet
In a 1990 study, the top 200 family names accounted for over 96% of a random sample of 174,900 persons, with over 500 other names accounting for the remaining 4%. Source: Internet
In many cases, a carefully chosen random sample can provide more accurate information than attempts to get a population census. Source: Internet