Refresh your competency in the various areas of Mathematics.

**In this module, you can study ****the basic statistical measures of dispersion: range, variance and standard deviation.**

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Variation and standard deviation both show how spread out the data set is.

A data set of any size can have a large or a small standard deviation.

**Study and practice**

- Study variance and standard deviationMathsisfun.com does a good job of explaining how to find variance and standard deviation. At the end of this page, you will find a quiz to test your knowledge. For a more advanced discussion, see www.onlinemathlearning.com/variance.html.
- Quiz yourself on standard deviation by building your own quizMake a list of numbers (a data set) and use this online calculator to find the standard deviation of the set. Compare the calculator's answer to your own worked-out answer to see if you have it right.

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