DA0-002 Visualization and Reporting Practice Question
Which TWO actions are best practices for creating effective data visualizations?
⚠ Common exam trap
CompTIA often tests the misconception that maximizing data-ink ratio means eliminating all whitespace, when in fact whitespace is a critical design element for readability and should be preserved judiciously.
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
✓
Avoid using more than five slices in a pie chart
Option A is correct because limiting a pie chart to about five slices keeps each wedge large enough to compare visually; beyond that, similar-sized slices become indistinguishable and the chart loses its purpose, so consolidating minor categories into an 'Other' slice is a recognized best practice. Option E is correct because assigning colors consistently to the same data values or categories across all visuals in a report prevents misreading and lets viewers track a series reliably, which is a core principle of effective encoding. The unmarked options do not belong: B is wrong because maximizing data-ink ratio means removing non-data ink, not all whitespace, since whitespace improves grouping and readability; C is wrong because high-contrast gridlines compete with the data and should be muted or omitted when not needed; and D is wrong because 3D effects distort proportions and add perspective that misrepresents values rather than making charts more professional.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Avoid using more than five slices in a pie chart
Why this is correct
Capping pie slices at five preserves accurate part-to-whole comparison, since human perception struggles to judge angles beyond a handful of wedges. This satisfies the best-practice constraint by preventing cluttered, unreadable charts, so viewers can distinguish each category's proportion at a glance rather than squinting at slivers.
- ✗
Maximize data-ink ratio by removing all whitespace
Why it's wrong here
Removing all whitespace compresses elements together, harming legibility and grouping; data-ink ratio targets non-data ink such as redundant borders, not deliberate spacing. The principle is tempting because it genuinely improves clarity when applied to chartjunk rather than layout breathing room.
- ✗
Always include gridlines with high contrast
Why it's wrong here
High-contrast gridlines compete with the data marks for attention, obscuring trends rather than supporting them. Gridlines are tempting because they aid value lookup, and would be correct when rendered subtly in a light grey behind the series.
- ✗
Use 3D effects to make charts look professional
Why it's wrong here
3D effects distort perspective, making values harder to compare accurately across bars or slices. They are tempting because they appear polished in presentation slides, and would be acceptable only for decorative, non-analytical graphics where precise reading is not required.
- ✓
Use color to represent data values consistently
Why this is correct
Consistent colour mapping lets viewers compare values across charts without relearning the encoding each time, directly satisfying the best-practice requirement for effective visualisations. Assigning the same hue to identical categories or magnitudes reduces cognitive load and prevents misreading trends.
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