DA0-002 Visualization and Reporting Practice Question
A data analyst needs to visualize sales per capita across U.S. states. States with small populations but high sales (e.g., Delaware) appear too prominent on a choropleth map. Which technique best addresses this issue?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a choropleth map with rates instead of raw sales
A choropleth map using rates (sales per capita) normalizes for population, preventing small-population states with high sales from appearing overly prominent. Options A, C, and D do not properly normalize the data: A changes chart type but does not normalize, C uses raw sales, and D applies a log scale which distorts the relationship without normalizing for population.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Switch to a bar chart sorted by sales
Why it's wrong here
Bar chart does not account for population differences.
- ✓
Use a choropleth map with rates instead of raw sales
Why this is correct
Choropleth mapping rates (e.g., per capita) normalizes geographic areas.
- ✗
Use a bubble chart with size proportional to sales
Why it's wrong here
Bubble charts can overlap and do not normalize for population.
- ✗
Apply a log scale to the color gradient
Why it's wrong here
Log scale compresses values but does not normalize for population.
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