I'm using ArcMap 10.3.1, 180-day trial version, to do a population density per square mile map with graduated colors but instead of getting a map with different colors for the different classes, my entire map is all one color and it's the color for the lowest value class. I checked the histogram and there are values for the other break points but it's not reflected in the map.
- Using Census Block Group data, I added a column to the layer's attribute table, called it "SqMiles" and set the type to Float.
- On the attribute table, for the new column, I right-clicked and selected "Calculate Geometry", set Property to "Area" and Units to "Square Miles".
- For Layer Properties, Symbology tab, Quantities > Graduated Colors, I set the value field to "Population 2010" and Normalization field to "SqMiles" (the column that Calculate Geometry populated).