DA0-002 Visualization and Reporting Practice Question
A data analyst is tasked with creating a report that shows the proportion of total sales contributed by each product category. The analyst wants to use a chart that clearly displays the parts of a whole. Which chart type is most appropriate?
⚠ Common exam trap
The trap here is selecting a chart that is familiar but mismatched to the data type, such as a line chart for categorical proportions.
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 appropriate because it visually represents each product category's share of total sales as slices of a whole. This directly addresses the requirement to show proportions, making it easy for the audience to compare contributions at a glance.
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 continuous variable by grouping data into bins. It is not designed to show parts of a whole or categorical proportions. Using a histogram for sales by product category would incorrectly treat categories as a continuous scale and fail to convey the relative contributions clearly.
- ✗
Scatter plot
Why it's wrong here
A scatter plot is used to visualize the relationship between two continuous variables, not to show proportions. It plots individual data points to reveal correlation or patterns. Applying it to categorical sales proportions would be meaningless because there is no pair of continuous variables to compare. Thus, it is not suitable here.
- ✗
Line chart
Why it's wrong here
A line chart is designed to show trends over time, not proportions of a whole. It connects data points to illustrate continuity, which is irrelevant when displaying categorical contributions to a total. Using a line chart for parts of a whole would confuse the audience and fail to convey the intended message about sales distribution.
- ✓
Pie chart
Why this is correct
A pie chart is specifically designed to show how individual categories contribute to a total, with each slice representing a proportion. It is ideal for displaying the percentage of total sales by product category, as it visually communicates the parts of a whole in an intuitive way. This makes it the most appropriate choice for the scenario.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
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.