DA0-002 Visualization and Reporting Practice Question
A data analyst is presenting a time-series chart of monthly sales to executives. The sales dropped sharply in March due to a one-time supply chain disruption. Which storytelling technique would best help the audience understand this anomaly?
⚠ Common exam trap
A common mix-up: candidates choose to smooth or remove the anomaly (options B or D) to make the chart look cleaner, failing to recognize that ethical data storytelling requires explaining, not hiding, significant events.
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
✓
Add an annotation explaining the supply chain disruption
Adding an annotation directly on the chart provides immediate context for the March sales drop, allowing executives to understand the anomaly without leaving the visualization. This technique follows the principle of 'contextual annotation' in data storytelling, where key events are marked to prevent misinterpretation of trends. It preserves data integrity while clarifying the cause, which is essential for accurate 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.
- ✓
Add an annotation explaining the supply chain disruption
Why this is correct
Correct. Annotations provide context for key events.
- ✗
Remove the March data point to avoid confusion
Why it's wrong here
Removing data distorts the story.
- ✗
Use a different chart type to hide the drop
Why it's wrong here
Hiding data is misleading and unethical.
- ✗
Use a moving average to smooth the drop
Why it's wrong here
Smoothing can obscure important events.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DA0-002 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DA0-002 exam.