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4 Tutorials that teach Calculating Standard Deviation

# Calculating Standard Deviation

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Author: Katherine Williams
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Calculate the standard deviation of a given data set using the standard deviation formula or Excel.

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Tutorial

Source: Image of Graph Creative Commons Graph: http://wikimediafoundation.org/wiki/File:6_Sigma_Normal_distribution.jpg

Terms to Know
Standard Deviation

A typical amount by which we would expect a data point to differ from the mean. Typically, about half to two-thirds of the data points fall within one standard deviation of the mean.

Variance

The square of standard deviation. While it has some uses in statistics, it is not a practical unit of measurement. It is calculated the same way as standard deviation, but without the square root.

Formulas to Know
Standard Deviation of a Sample

Variance of a Sample

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