Quick Answer
The answer is truncating the y-axis to exaggerate differences, as this distorts the viewer’s perception of scale and is a classic example of misleading data visualization. This mistake violates the principle of proportional ink, where the visual representation of data should match the actual numerical values; by starting the y-axis at a value other than zero, even small changes appear dramatic, undermining data integrity. On the CompTIA Data+ DA0-001 exam, this concept tests your understanding of ethical data presentation and is often paired with traps like using 3D pie charts or dual y-axes that confuse comparisons. A common memory tip is to remember the “zero rule”: always start bar charts and line graphs at zero unless you have a clear, labeled reason not to, as exam scenarios frequently hide exaggeration in truncated axes.
This DA0-001 practice question tests your understanding of visualizing data. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which THREE of the following are common mistakes when creating data visualizations? (Choose 3.)
Choosing the correct chart type for the data
Why wrong: This is a best practice.
Using a 3D pie chart
3D distorts angles and makes comparison harder.
Labeling axes clearly
Why wrong: This is a best practice, not a mistake.
Using a non-zero baseline for bar charts
Non-zero baseline can misrepresent magnitude.
Truncating the y-axis to exaggerate differences
Misleading because it magnifies small differences.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Using a 3D pie chart
Option B is correct because 3D pie charts distort the perception of proportions by adding a false depth dimension, making it difficult for viewers to accurately compare slice sizes. This violates the principle of data-ink ratio and is widely discouraged in data visualization best practices.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Choosing the correct chart type for the data
Why it's wrong here
This is a best practice.
Using a 3D pie chart
Why this is correct
3D distorts angles and makes comparison harder.
Related concept
Read the scenario before looking for a memorised answer.
Labeling axes clearly
Why it's wrong here
This is a best practice, not a mistake.
Using a non-zero baseline for bar charts
Why this is correct
Non-zero baseline can misrepresent magnitude.
Related concept
Read the scenario before looking for a memorised answer.
Truncating the y-axis to exaggerate differences
Why this is correct
Misleading because it magnifies small differences.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
CompTIA often tests the misconception that adding visual flair (like 3D effects) improves a chart, when in reality it reduces accuracy; the trap here is that candidates may think 3D pie charts are acceptable because they look 'professional' or 'modern'.
Detailed technical explanation
Under the hood, 3D pie charts introduce perspective distortion that alters the apparent area of slices, especially those at the front or back, leading to misjudgment of relative magnitudes. In real-world scenarios, such as financial reporting or survey results, this can cause stakeholders to draw incorrect conclusions about market share or response distribution. The human visual system is poor at comparing volumes in 3D, making 2D bar charts or treemaps more reliable alternatives.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the DA0-001 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Visualizing Data — study guide chapter
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FAQ
Visualizing Data — This question tests Visualizing Data — Read the scenario before looking for a memorised answer..
The correct answer is: Using a 3D pie chart — Option B is correct because 3D pie charts distort the perception of proportions by adding a false depth dimension, making it difficult for viewers to accurately compare slice sizes. This violates the principle of data-ink ratio and is widely discouraged in data visualization best practices.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
About these practice questions
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Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which TWO are common mistakes when creating data visualizations?
easyWhy A: Options A and D are correct. Truncated axis (A) can mislead, and excessive 3D effects (D) distort data. Option B is wrong because using a legend is good. Option C is wrong because sorting alphabetically can be helpful for lookup. Option E is wrong because color-blind friendly palettes are a best practice.
Last reviewed: Jun 30, 2026
This DA0-001 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 DA0-001 exam.
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