Choropleth maps can easily mislead. These short videos share advice and examples to help explain normalization and other considerations for mapping filled areas of color.
When mapping quantitative data in polygons, use size for raw values and color for derived values. This video shares examples and analogies to help make sense of this cartographic rule.
What does it mean to normalize data? When and why do you need to do it? This video shares an example in ArcGIS Online and ArcGIS Pro.
When normalizing a choropleth map, your goal is to allow for more meaningful comparisons. This video shows examples of how to achieve this.
Tips and techniques for designing maps with the Counts and Amounts (color) style in ArcGIS Map Viewer.