Discussion
An advantage of a dot map over a shaded area map is that it
Answer: C
Correct answer: shows variation within each areal unit
A choropleth fills the whole unit with one tone, implying a uniformity that rarely exists. A dot map places dots where the phenomenon actually is, so an empty half of a district appears empty and a crowded corner appears crowded - and clusters that straddle boundaries become visible. Dot maps do also work directly from counts, but that is a difference in data requirement rather than the advantage the technique exists for.
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