Scatterplot

http://www.fda.gov/RegulatoryInformation/Guidances/ucm127509.htm

       Scatterplots show two different variables and how they correlate with each other. They do this by plotting dots to show each variables information. For example, a scatterplot could show the relation of the amount of cigarettes smoked to lung cancer deaths. Shown above are the responses for a certain study that  uses two variables.