What Is Sample Variance In Statistics
Sample variance is defined as following;
S^2 = SUM(xi – xmean)^2 / n – 1
And it is the point estimate of the population variance
Get the Essentials of business statistics, third edition, by Bruce L. Bowerman, Richard T, A O’connell, J.B Orris and Emily S. Murphree. It is a good textbook of business statistics.