Visual Summary: Computational
Formulas
for the Variance and the Standard Deviation
Decide if you have a Population or a Sample Population Sample 

ê 
Compute the Sum of the X

Compute the Sum of the X


ê 
Compute the Sum of the X^{2}

Compute the Sum of the X^{2}


ê 
Compute the Variance

Compute the Variance


ê 
Compute the Standard Deviation

Compute the Standard Deviation

[Top of Page] [News]
[FAQ] [Hints]
[Course News] [Course Outline] [Chapter Outlines] [Homework] [Practice Tests] [Dr. Vernoy]
Copyright © 2004 by Mark W. Vernoy