Statistics and Probability Dictionary

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Random Variable

When the value of a variable is the outcome of a statistical experiment , that variable is a random variable.

An example will make this clear. Suppose you flip a coin two times. This simple statistical experiment can have four possible outcomes: HH, HT, TH, and TT. Now, let the variable X represent the number of Heads that result from this experiment. The variable X can take on the values 0, 1, or 2. In this example, X is a random variable; because its value is determined by the outcome of a statistical experiment.

See also:   Statistics Tutorial: Probability Distributions