Boxplot

Boxplots are good tools for recognizing outliers in a set of data. The box is set up to provide a five number summary which includes the mean, median, quartiles, and any outlier that may exist. Boxplots are advantageous in that one can graph two sets of data on the same graph in order to compare them. The diagram below is just to show the viewer how a boxplot is set up on an axis either horizontally or vertically.





http://www.math.sfu.ca/~cschwarz/Stat-301/Handouts/boxplot.png