If you have two types of data that you need to compare, you might use something called a scatterplot. A scatterplot is a type of mathematical graph and is used mostly when there is a variable that exists that the experimenter has control over. You can find more information here: http://en.wikipedia.org/wiki/Scatter_plo...

Scatter plot is a graph to show the link between two variables, also known as correlation. Scatter plots are like line graphs since both utilize vertical and horizontal axes to mark data points.