Box Plot

A box plot or box and whisker plot is a graph that is used to display statistical data. The box plot consists of five parts. The beginning of the plot starts with the minimum value of the data. The second point, the lower quartile, signals the formation of the box. The third point signals the median value of the data. The fourth point, the upper quartile, signals the end of the box. The fifth point signals the maximum point for the set of data. The box plot can be used to analyze data. It is easy to show if the data is skewed, and it is easy to determine outliers. The example picture uses multiple box plots to show the relationship between the day of the week and the amount of times a certain website was hit. It can be determined that Tuesday had the most hits, and Monday had the widest range for amount of hits. It can also be determined that this website may be used mostly by businesses because Saturday had the least amount of hits and the most outliers.

Ex. --> to show where points located

http://support.sas.com/rnd/app/da/new/daunivariate.html

http://ellerbruch.nmu.edu/cs255/jnord/boxplot.html