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

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- 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 deviationThis five-question quiz from usablestats.com checks your understanding of the concept of standard deviation.
- 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.

0.00 min addition (+), subtraction (-), multiply (x), divide (÷)

1.19 min decimal point

2.43 min C, CE and backspace

4.19 min square, square root & fractions

6.17 min percentage (%)