DA0-002 Visualization and Reporting Practice Question
You are a data analyst for an e-commerce company. Your team has built a dashboard to monitor daily sales performance across five regions: North, South, East, West, and Central. The dashboard includes a bar chart showing total sales per region, a line chart showing daily sales trend over the past 30 days, and a pie chart showing sales distribution by product category (Clothing, Electronics, Home, Books, Sports). Recently, stakeholders have complained that the pie chart is hard to interpret because the Sports category has very small sales and is barely visible. Also, the bar chart uses a rainbow color scheme that makes it difficult to compare bar heights because the colors are not ordered by magnitude. The line chart is fine. You need to redesign the dashboard to address these issues. Which combination of changes is most appropriate?
⚠ Common exam trap
CompTIA often tests the misconception that simply highlighting or separating a small slice (exploding or 3D) fixes pie chart readability, when in fact it does not address the fundamental issue of angle comparison for tiny values.
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
✓
Group small categories into an 'Other' slice in the pie chart and use a sequential color scheme ordered by sales for the bar chart
Grouping small categories into an 'Other' slice directly addresses the pie chart's readability issue by consolidating negligible values, and using a sequential color scheme ordered by sales for the bar chart improves the ability to compare bar heights by encoding magnitude through color intensity. This combination follows best practices for data visualization: avoid cluttering with tiny slices and use ordered, perceptually uniform colors to facilitate accurate comparisons.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Replace the pie chart with a stacked bar chart and use a categorical color scheme for the bar chart
Why it's wrong here
Stacked bar shows composition over time, not needed; categorical colors don't reflect magnitude.
- ✗
Explode the Sports slice in the pie chart and use a monochromatic color scheme for the bar chart
Why it's wrong here
Exploding still shows small slice; monochromatic may not differentiate regions.
- ✗
Change the pie chart to a 3D pie chart and use a diverging color scheme for the bar chart
Why it's wrong here
3D pie distorts perception; diverging colors not ideal for ranking.
- ✓
Group small categories into an 'Other' slice in the pie chart and use a sequential color scheme ordered by sales for the bar chart
Why this is correct
Grouping small categories improves pie readability; sequential colors ordered by magnitude helps bar comparison.
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