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## 7.1.3 Range

The range is the difference between two extreme observations of the data. If A and B are the greatest and the smallest observations respectively in a data, then its range is A-B. Range is the simplest but a crude measure of dispersion. Since it is based on two extreme observations which themselves are subject to chance fluctuations, it is not at all a reliable measure of dispersion. |

Last modified: Thursday, 22 March 2012, 10:06 AM