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Unformatted text preview: Q 2 ) is defined as the 50th percentile, which is, in fact, the median of all the measures. The upper quartile ( Q 3 ) is defined as the 75th percentile; thus, only 25 percent of the measures are above the upper quartile. The interquartile range ( IQR ) is the value for Q 3 Q 1 . Like the range, it is a single value. Figure 5 illustrates the locations of the median and the quartiles for a set of 20 test scores. Figure 5. An illustration of the quartiles and the interquartile range....
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- Fall '08