DA0-002 Visualization and Reporting Practice Question
A data analyst creates a bar chart to compare average customer satisfaction scores across five departments. The chart shows very tall bars for three departments and very short bars for two departments, making differences hard to assess. What is the most likely cause and the best fix?
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
✓
The y-axis does not start at zero; reset it to zero
A bar chart's y-axis should start at zero to accurately represent proportions; a truncated y-axis can exaggerate differences between bars. Option A is wrong because grouping by region does not address the axis scaling issue. Option C is wrong because a line chart is not suitable for comparing discrete categories. Option D is wrong because 3D charts can introduce visual distortion and are not recommended.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The chart should group departments by region to reduce variance
Why it's wrong here
Grouping does not address the axis scaling issue.
- ✓
The y-axis does not start at zero; reset it to zero
Why this is correct
Starting the axis at zero prevents misleading comparisons; non-zero start exaggerates differences.
- ✗
The data should be visualized as a line chart instead
Why it's wrong here
Line charts are for trends, not for comparing categorical data.
- ✗
The bar chart should be replaced with a 3D version for better depth
Why it's wrong here
3D charts can distort perception and are not recommended for precise comparisons.
Go deeper
Related to this question
About these practice questions
One of 986 original DA0-002 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.