Classed Choropleth Map

This is a classed choropleth map of the United States from the 2000 Census. It gives a ratio of males to every 100 females. It is divided into four classes that are distinguishable by shades of yellow, orange, and red. The main objective of classed choropleth maps, like this one, is to determine height and shading or color intensity for each class.

http://www.ilstu.edu/~jrcarter/Geo204/Choro/