A Nominal Area Chorolpleth Map is a thematic map that is used to describe something about a predefined areal unit. By the use of different colors, it is easy for the maps viewer to make inferences about the map by simply looking at a color of a certain area on the map. Each different color on the map represents a different quartile. These maps use numbers which are raw, and have not been averaged.
The map shown displays how much money a certain school district spends on each child in it's school system. The darkest-shaded counties are those which have spent the greatest amount of money on their students, while the lightest-colord counties have not spent as much money on theirs.
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