# What Is Interquartile Range?

Interquartile range is the difference between the 75th percentile and the 25th percentile. The range is equal to the box length in a plot.
interquartile range - Definition [in-ter-kwawr-tahyl, -til]
(n.) The range of values of a frequency distribution between the first and third quartiles
Source: Dictionary.com
Q&A Related to "What Is Interquartile Range"
 In statistics, the interquartile range of the results is the difference between the first and third quartiles. This gives a more robust statistic, and is often used instead of total http://answers.ask.com/Science/Other/what_is_inter...
 1. Order your data points from least to greatest. For example, if your data points were 10, 19, 8, 4, 9, 12, 15, 11 and 20, you would rearrange them like this: {4, 8, 9, 10, 11, 12, http://www.ehow.com/how_6184494_calculate-interqua...
 the IQR is the third quartile minus the first quartile. http://wiki.answers.com/Q/What_is_the_interquartil...
 The semi interquartile range is a measure for spread or dispersion. To find it you have to subtract the first quartile from Q3 and divide that by 2, (Q3 - Q1)/2. http://wiki.answers.com/Q/What_is_the_semi_interqu...
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