DA0-002 Visualization and Reporting Practice Question
A data analyst is creating a report to compare the total sales revenue for five different product categories over the last four quarters. The analyst wants to show both the overall total and how each category contributes to that total for each quarter. Which chart type is most appropriate?
⚠ Common exam trap
Many candidates confuse a grouped bar chart, which compares individual categories, with a stacked bar chart, which shows part-to-whole relationships and totals.
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
✓
A stacked bar chart with quarters on the x-axis and sales on the y-axis, with segments for each category.
A stacked bar chart is ideal for showing both total values per quarter and the contribution of each category to those totals. It allows viewers to compare overall quarterly sales and see how the product mix changes over time. The other chart types either omit the total, obscure the part-to-whole relationship, or lose the time dimension.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
A pie chart with one slice per category, using the total sales across all quarters.
Why it's wrong here
A pie chart shows the proportion of each category to the grand total across all quarters, but it loses the quarterly breakdown. It cannot show how the mix changes from quarter to quarter, nor can it show the total sales for each quarter. This fails to meet the requirement of comparing quarterly totals and contributions.
- ✓
A stacked bar chart with quarters on the x-axis and sales on the y-axis, with segments for each category.
Why this is correct
A stacked bar chart displays the total sales for each quarter as the full height of the bar, while each segment represents a category's contribution to that total. This directly addresses both requirements: comparing overall totals across quarters and seeing the part-to-whole relationship within each quarter. It is the most appropriate choice for this scenario.
- ✗
A line chart with quarters on the x-axis and sales on the y-axis, with one line per category.
Why it's wrong here
A line chart is excellent for showing trends over time for each category, but it does not show the overall total sales per quarter. The viewer can see each category's trend but cannot easily determine the combined total or each category's proportion of that total. It is not ideal for part-to-whole comparisons.
- ✗
A grouped bar chart with quarters on the x-axis and sales on the y-axis, with one bar per category.
Why it's wrong here
A grouped bar chart shows individual category values side by side for each quarter, making it easy to compare categories within a quarter. However, it does not directly show the overall total for each quarter or the contribution of each category to that total. The viewer would have to mentally sum the bars, which is less effective for part-to-whole analysis.
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Last reviewed September 2026 · checked against the official CompTIA exam blueprint
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