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A random variable or stochastic variable is a value that is subject to chance variation (i.e., randomness in a mathematical sense).

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How to Understand the Relationships Among Random Variables, Samples, and Populations?

A 'random variable' is a mathematical object, more precisely a measurable function. A 'random' sample is not a mathematical object. It is only a way to pick individuals at random in a population. A …
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