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Concept

Interquartile Range

The interquartile range, or IQR, of a data set is a measure of spread that measures the difference between

Q_{3}

and

Q_{1},

the upper and lower quartiles.

IQR $= Q_{3} - Q_{1}$

The following applet shows how to find the IQR of different data sets.

Applet that calculates the interquartile range of a data set

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