Variance

In probability theory and statistics, variance is the expectation of the squared deviation of a random variable from its mean, and it informally measures how far a . Deviation just means how far from the normal. The Standard Deviation is a measure of how spread out . The variance is therefore equal to the second central moment mu_2. Note that some care is needed in interpreting sigma^as a variance, since the symbol . In order to write the equation that defines the variance, it is simplest to use the summation operator, Σ. The summation operator is just a shorthand way to write, .

Variance measures how far a data set is spread out. Step by step examples and videos; statistics made . X, and is denoted as Var(X) or σ(sigma-squared). The variance of X can also be called the second moment of X about the mean μ. Online calculator to compute the variance from a set of observations from a population or a sample.

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