DA0-002 Visualization and Reporting Practice Question
A data analyst is presenting a story to executives about a decline in sales. The analyst wants to show the key events that led to the decline, such as a product recall and a competitor's launch. Which storytelling technique should be used?
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
✓
Annotating the line chart with event markers
Annotating key events on a time-series chart directly links events to data changes, helping executives understand causes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Using a pie chart to show current market share
Why it's wrong here
Pie charts do not show timeline events.
- ✗
Adding a waterfall chart to show incremental changes
Why it's wrong here
Waterfall charts show incremental changes but do not inherently annotate events.
- ✓
Annotating the line chart with event markers
Why this is correct
Annotations on a line chart effectively highlight key events and their impact on trends.
- ✗
Using a treemap to show hierarchical proportions
Why it's wrong here
Treemaps show proportions, not time-series events.
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