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In probability theory and statistics, variance is the expectation of the squared deviation of a random variable from its mean. Informally, it measures how far a set ...


Variance measures how far a data set is spread out. Definition, examples of variance. Step by step examples and videos; statistics made simple!


The spread between numbers in a data set, measuring Variance is calculated by taking the differences between each number and the mean, squaring the ...


The variance is therefore equal to the second central moment mu_2 . Note that some care is needed in interpreting sigma^2 as a variance, since the symbol ...


Thinking about how we can estimate the variance of a population by looking at the data in a sample.


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,  ...


Define variance: the fact, quality, or state of being variable or variant : difference, variation — variance in a sentence.


Variance definition, the state, quality, or fact of being variable, divergent, different, or anomalous. See more.


Standard Deviation and Variance. Deviation just means how far from the normal. Standard Deviation. The Standard Deviation is a measure of how spread out ...