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Visual Summary:  Computational Formulas
for the Variance and the Standard Deviation


Decide if you have a Population or a Sample

Population                                                                                   Sample


Compute the Sum of the X


 

Compute the Sum of the X


 


Compute the Sum of the X2


 

Compute the Sum of the X2


Compute the Variance


 

Compute the Variance


Compute the Standard Deviation


 

Compute the Standard Deviation

 


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Copyright 2004 by Mark W. Vernoy