# Sample Variance

By Levi Clancy for Student Reader on *updated *

###### Computational formula for sample variance

σ^{2} = [ Σ ( X^{2} ) - ( Σ X )^{2} ] / [ n - 1 ]

###### Definitional formula for sample variance

σ^{2} = [ Σ ( X - ~~X~~^{2} ) ] / [ n - 1 ]

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