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Each member of the population has the same probability of being in the sample as any other. Equivalently, any set of members of the given sample size has the same probability of being selected as any other set.
A random distribution is a random sample set displayed in the form of a bell curve. See random sample set.
to select a random sample you pick them at random
a random friend put
It is important to make sure your random sample is random in order to make sure the results are accurate, and to prevent experimenter bias.