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
Combining small categories into an 'Other' group reduces the number of segments competing for limited bar height, so each remaining category occupies a larger, readable portion. This directly addresses the stem's constraint: tiny contributions that become illegible in a stacked bar. Aggregation preserves the total while restoring visual clarity.
- ✗
Change to a pie chart for each quarter
Why it's wrong here
Splitting each quarter into a separate pie still renders small categories as thin slices, so their contributions remain unreadable. It is tempting because pies show part-to-whole composition, but a redesign must give small categories their own visible space, such as a small-multiples or trellis layout.
- ✗
Increase the width of each bar
Why it's wrong here
Widening bars only enlarges the same stacked segments proportionally, leaving small categories as thin slivers. It is tempting because wider bars appear to add room, but the constraint is segment height, not bar width; the redesign must separate small categories onto their own axes or panels.
- ✗
Switch to a 3D stacked column chart
Why it's wrong here
A 3D stacked column adds perspective distortion and depth, which obscures the already-small segments further. It is tempting because 3D looks visually striking, but it introduces parallax error; the redesign must give small categories distinct visible space, such as small multiples or a separate chart.
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