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Question

What is the variance sign?


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Solution

Variance: The variance is the average squared deviation from the mean of the data set.

The population variance is denoted by the symbol σ2.

The sample variance is denoted by the symbol S2.

σ2=xi-μi=1NN, where σ2is population variance, xi is the value of ith element, μ is population mean, and N is population size.

S2=xi-x¯i=1nn-1, where S2is sample variance, xi is the value of ith element, xi is sample mean, and n is sample size.


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