Box Plot

This box plot shows the stopping distances of three different designs of a product. Box plots can be useful to display differences between populations without making any assumptions of the underlying statistical distribution they are non-parametric. The spacings between the different parts of the box help indicate the degree of dispersion and skewness in the data, and identify outliers. Box plots can be drawn either horizontally or vertically.

Image Source: http://math.youngzones.org/boxplot.gif