A sample consists of a small portion of data when a population is taken from a large amount.
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Random error.
From a sample of a population, the properties of the population can be inferred.
A representative sample is a randomly selected subset of the population.
A sample of a population is a subset of the population. The average of the population is a statistical measure for some variable of the population.
A sample is any subset of the total population. A representative sample is one that is chosen so that its characteristics are similar to that of the population.