Choropleth Map

This is a Choropleth map. It shows the ratio of males to females throughout the United States. The intervals range from 89-92, 93-95, 96-98, 99-101, 102-104, and 105-107 males to 100 females in each state. It looks like there are more males to females in the Western part of the United States than the Eastern part, especially in Alaska.
http://www.ilstu.edu/~jrcarter/Geo204/Choro/map-AmFact-6eqint-orange-80pct.jpg