DA0-002 Data Governance Practice Question
A data analyst needs to communicate a forecast with uncertainty. Which visualization is best?
⚠ Common exam trap
Watch out — candidates often confuse a histogram (which shows data distribution) with a line chart that includes uncertainty bands, or they may think a pie chart can somehow represent forecast uncertainty through slices.
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
✓
Line chart with confidence intervals
A line chart with confidence intervals is the best choice because it explicitly visualizes the forecast trend over time while also displaying the range of uncertainty (e.g., 95% confidence bands). This allows the data analyst to communicate both the central projection and the variability around it, which is essential for informed decision-making.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Stacked bar chart
Why it's wrong here
Stacked bars are for comparing parts of a whole, not uncertainty.
- ✗
Pie chart
Why it's wrong here
Pie charts show proportions, not uncertainty.
- ✓
Line chart with confidence intervals
Why this is correct
This shows the forecast trend and the uncertainty range clearly.
- ✗
Histogram
Why it's wrong here
Histograms show distribution, not forecast uncertainty over time.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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