DA0-002 Visualization and Reporting Practice Question
An analyst creates a stacked bar chart showing quarterly sales by product category. The chart becomes hard to read because some categories have very small contributions. Which redesign is most effective?
⚠ Common exam trap
Watch out — candidates often think adding more visual elements (3D, wider bars) or changing chart types (pie) will fix readability, when the real solution is data aggregation to reduce cognitive load.
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
✓
Combine small categories into an 'Other' group
Combining small categories into an 'Other' group reduces visual clutter and improves readability by aggregating negligible contributions into a single bar segment. This technique preserves the overall trend while eliminating the noise from many tiny slices that make the stacked bar chart hard to interpret.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Combine small categories into an 'Other' group
Why this is correct
Grouping small items simplifies the chart and improves readability.
- ✗
Change to a pie chart for each quarter
Why it's wrong here
Pie charts also struggle with small slices.
- ✗
Increase the width of each bar
Why it's wrong here
Wider bars don't make small segments more readable.
- ✗
Switch to a 3D stacked column chart
Why it's wrong here
3D makes comparison harder, especially for small segments.
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