Step 4. If you wanted to show the population by county, you would need to define quantities as colors. This arranges and displays the data in specific categories. Right click on countbnd.shp in the table of contents. This will bring up a box of choices. At the bottom of the box is properties, click on this choice.
Step 5. Scroll across the top to the Symbology tab. This will allow you to change the representation of multiple symbols in the table of contents: Features, Categories, Quantities, Charts, Multiple Attributes
Step 6. To represent counties by population as a function of color, we will need to choose the Quantities option. Under this option select Graduated Colors. The Value drop-down list allows you to choose from any of the attributes for the Countbnd.shp. We will choose the POP1990 option, since we want the colors to represent 1990's population.
Note: ArcMAP will automatically choose a Color Ramp and Classification breaks for your project. Both of these functions can be altered to your own specific needs.
Step 7. Click OK. Now each county is shown as a color that represents a range of population values.
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