Histogram

http://www.socialresearchmethods.net/kb/statcorr.php

A histogram is a graphical representation of a data set. A histogram is probably one of the earliest graphs a elementary student learns how to read/make. Of course as a child we called them bar graphs...nothing as fancy as a histogram. 

This histogram is a list of heights and the frequency in which they occur. This is something very similar to what I did in school, however this one was a part of a correlation study in which height was correlated to self-esteem.