Are There Any Outliers?. Using the 1.5*IQR Rule. Say we have the following data: 1,2,5,5,7,8,10,11,11,12,15,20. Notice that you must have ordered data before you can find the Five – Number – Summaries . . Find the median first. It’s the middle point.
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Using the 1.5*IQR Rule
IQR = 12 – 5 = 7
5 - 1.5 * 7 = -5.5
12 + 1.5 * 7 = 22.5
25 is considered an outlier and will be a point in a boxplot and the ‘whisker’ ends at the last non-outlier data point.