Scatter diagram
From HandWiki
The elements 
of a sample can be visualized without loss of accuracy by marking for each element a stroke at the corresponding place on an X axis. The resulting figure is a one-dimensional scatter diagram. (Usually one prefers to construct a one-dimensional histogram). If the elements of the sample are pairs (Xi, Yi), File:Hepa img1008.gif of two variables they are marked as points in an X,Y-plane. In the resulting two-dimensional scatter diagram a correlation between X and Y (viz. a sizeable correlation coefficient) can often be detected by mere visual inspection of the data.
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