Statistical Map

http://www.mappery.com/map-of/United-States-Travel-Time-to-Work-Statistical-Map

A statistical map is a type of map that indicates the variation in quantity of the variable in a geographic area. "Statistical map" is an encompassing umbrella term for maps that use statistics such as numerical maps, choropleth maps, contour maps, isopleth maps, dot maps, proportional circle maps, symbol maps, pie chart maps, and histogram maps. The statistical map shown above shows mean commuter time to work from 2003 which is averaged for every state and shows statistical variable differences easily with the class key on the bottom right of the map.