DA0-002 Visualization and Reporting Practice Question
A dashboard shows sales by region using a map with color intensity. Users complain that two regions with very different sales appear nearly the same color. What is the most likely cause?
⚠ Common exam trap
The trap here is that candidates may attribute the problem to hardware limitations (monitor resolution) or user physiology (color blindness) rather than recognizing it as a fundamental data visualization design flaw in the color scale selection.
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
✓
The color scale uses a sequential palette with insufficient contrast
The issue is that the color scale uses a sequential palette with insufficient contrast between adjacent data values. When the color gradient is too narrow or uses similar hues, regions with significantly different sales figures map to nearly identical colors, making the visualization ineffective. This is a common problem in data visualization when the color mapping does not span the full range of the data or uses a perceptually uniform palette poorly.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The map projection is distorted
Why it's wrong here
Projection affects area shape, not color encoding.
- ✓
The color scale uses a sequential palette with insufficient contrast
Why this is correct
Sequential palettes can have low perceptual difference between adjacent values.
- ✗
The monitor resolution is too low
Why it's wrong here
Resolution affects sharpness, not color differentiation.
- ✗
Users are color blind
Why it's wrong here
While possible, the issue is more likely the color scale design.
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Written by Johnson Ajibi, MSc IT Security
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