Sample
From HandWiki - Reading time: 1 min
A number of observations 
of a random variable. A sample is a random sample if the probability density describing the probability for the observation of 
is given by a product
This implies in particular that the Xi are independent, i.e. that the result of any observation does not influence any other observations. In statistical nomenclature, sample is usually short for random sample , taken from a population .
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