Upper And Lower Quartile Range. I can compare and analyze two data sets represented in boxplots. The interquartile range is a better measure of dispersion than the range.
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The following figure shows the median quartiles and interquartile range. Quartiles divide a set of numbers into four equal parts. I can make observations and inferences about data represented in a boxplot.
If there are 4 n 1 data points then the lower quartile is 25 of the n th data value plus 75 of the n 1th data value.
So the interquartile range is the difference between the upper quartile and lower quartile. Interquartile range upper quartile - lower quartile 47 - 38 9 cm. Interquartile Range Q 3 Q 1. The interquartile range is 58 52 or 6.
