Sample Variance
Computational formula for sample variance
σ2 = [ Σ ( X2 ) - ( Σ X )2 ] / [ n - 1 ]
Definitional formula for sample variance
σ2 = [ Σ ( X - X2 ) ] / [ n - 1 ]
// tag should be overline
σ2 = [ Σ ( X2 ) - ( Σ X )2 ] / [ n - 1 ]
σ2 = [ Σ ( X - X2 ) ] / [ n - 1 ]
// tag should be overline