DA0-002 Visualization and Reporting Practice Question
Which chart type is best for showing the number of website visitors at each stage of a conversion funnel, from initial visit to purchase?
⚠ Common exam trap
Many candidates confuse a funnel chart with a waterfall chart because both show sequential steps, but a waterfall chart is for cumulative changes (additions/subtractions), not for displaying the count at each stage of a funnel.
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
✓
Funnel chart
A funnel chart is specifically designed to visualize the progressive reduction in volume across stages of a linear process, such as a conversion funnel. It clearly shows the number of visitors at each stage (e.g., initial visit, product view, add to cart, purchase) and the drop-off between them, making it the optimal choice for this scenario.
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
A stacked bar chart segments each bar into sub-categories, so it suits showing how a total decomposes into parts, not a single sequential count per funnel stage. Funnel stages are ordered, discrete steps, so a chart plotting one value per stage is required. Stacking would imply composition within each stage that the question does not describe.
- ✗
Treemap
Why it's wrong here
A treemap encodes hierarchical part-to-whole relationships as nested rectangles sized by value, which suits portfolio or disk-usage breakdowns, not sequential funnel stages. Funnel data has an inherent order from visit to purchase that treemap layout does not preserve. A chart plotting one count per ordered stage is required instead.
- ✓
Funnel chart
Why this is correct
A funnel chart plots sequential stages as progressively narrowing bars, directly representing drop-off between visit and purchase. This matches the requirement to show visitor counts at each conversion stage, which bar, line or pie charts cannot express as clearly.
- ✗
Waterfall chart
Why it's wrong here
A waterfall chart is unsuitable for visualising a conversion funnel because it primarily illustrates the cumulative effect of sequential positive or negative changes to an initial value, rather than the absolute quantity remaining at each stage. While a conversion funnel shows progressive reduction, a waterfall chart focuses on contributions to a final total. It is tempting as funnels involve sequential changes, but a waterfall chart is typically used to show how a starting value, such as profit or inventory, is impacted by various positive and negative factors to arrive at an end value.
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