Box Plot

http://www.freakonomics.com/2011/04/21/digging-up-the-roots-of-language/

Box plots show the mean and maximum and minimum for quantitative data groups. The Atkinson study used 504 different languages to study phonemes which are essentially sounds and tones that comprise language. This box plot shows phonemic diversity in different regions on the world. Because the study results point to language originating in Africa the box plot allows differences between regions closer to and farther away from Africa to be compared.