Box Plot- Also known as a box and whisker diagram. Provides a simple graphical summary of a data set, showing a measure of central location (median), average, and measures of dispersion (upper and lower quartiles). These are especially useful for comparing two or more data sets. Outlying data is indicated by points. This is a box plot of hits for a particular website in early 1999 based on days of the week. It can be noted that the average number of hits per day stayed consistently between 1,000 and 1,500 Monday through Friday, but dropped significantly on Saturday and Sunday (http://support.sas.com/rnd/app/da/new/daunivariate.html).
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