The population variance is the average of the squared deviations from the mean. The sample variance is the sum of the squared deviations from the mean divided by one less than the number of data values.

Population Variance ()

Sample Variance (s2)

where

N |
= number of data values (for a population) |

n |
= number of data values (for a sample) |

xi |
= ith data value |

See Also

95% and 99% Confidence Interval for the Mean

Critical Value of K-S Statistic at 90%, 95%, and 99% Significance Level

Kolmogorov-Smirnov Goodness of Fit Statistic for Normal Distribution