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