DA0-002 Data Analysis Practice Question
A data analyst is creating a visualization to show the proportion of total sales contributed by each of five product categories. The analyst wants to emphasize the relative size of each category as part of a whole. Which type of chart is most appropriate?
⚠ Common exam trap
It's easy for candidates to confuse part-to-whole visualization with other chart types; pie charts are specifically designed for proportions, but they are often misused for too many categories.
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
✓
Pie chart
A pie chart is the most suitable because it visually represents each category as a slice of the whole, making it easy to compare proportions. Line charts, scatter plots, and histograms serve different purposes and do not effectively communicate part-to-whole relationships.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Histogram
Why it's wrong here
A histogram displays the distribution of a single numerical variable by binning values. It shows frequency or density, not proportions of a whole across categories. It is not appropriate for comparing categorical contributions to a total.
- ✗
Line chart
Why it's wrong here
A line chart is used to display trends over time or ordered categories, not proportions of a whole. It connects data points to show continuity, which is not suitable for comparing parts of a total. Using a line chart here would misrepresent the data as a sequence rather than a composition.
- ✗
Scatter plot
Why it's wrong here
A scatter plot shows the relationship between two numerical variables, with each point representing an observation. It is not designed to show parts of a whole or proportions. Using a scatter plot for this purpose would not convey the relative sizes of categories effectively.
- ✓
Pie chart
Why this is correct
A pie chart is designed to show parts of a whole, with each slice representing a proportion of the total. It is ideal for displaying the relative contribution of a small number of categories, such as five product categories, to a total. It visually emphasizes the size of each category in relation to the whole.
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Last reviewed September 2026 · checked against the official CompTIA exam blueprint
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