Sample Variance Calculator
Calculate sample variance with confidence interval and deviation analysis
About Sample Variance
Sample variance measures the spread of data points around the sample mean. It uses Bessel's correction (dividing by n-1) to provide an unbiased estimate of population variance.
Sample Variance Formula: s² = sum((x - x-bar)²) / (n - 1)
Population Variance Formula: sigma² = sum((x - mu)²) / N
The coefficient of variation (CV) expresses standard deviation as a percentage of the mean, useful for comparing variability across datasets with different units.