Box plots display the distribution of data by using a rectangular box and whiskers. Whiskers are lines that indicate a data range outside of the box.
Image and description taken from SAS/Graph(R) 9.2: Statistical Graphics Porcedures Guide, Second Edition (https://support.sas.com/documentation/cdl/en/grstatproc/62603//HTML/default/viewer.htm#vbox-stmt.htm, accessed February, 24, 2017).
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