DA0-002 Visualization and Reporting Practice Question
Which THREE of the following are common mistakes when creating data visualizations? (Choose 3.)
⚠ Common exam trap
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'.
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
✓
Using a 3D pie chart
Option B is correct because 3D pie charts distort the proportions of slices through perspective and depth, making values harder to compare accurately and adding visual clutter that misleads viewers. Option D is correct because bar charts encode value by bar length, so a non-zero baseline breaks that proportional encoding and visually exaggerates or shrinks differences between categories. Option E is correct because truncating the y-axis (especially on line or bar charts) compresses or magnifies the visible range, which can manufacture trends or differences that are not meaningful in the underlying data. Options A and C are not mistakes but best practices: choosing the correct chart type for the data ensures the visual encoding matches the data relationship, and labeling axes clearly gives viewers the units, scale, and context needed to interpret the chart correctly.
Answer analysis
Option-by-option breakdown
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
Selecting a chart type that matches the data's structure and comparison intent is correct practise, not a mistake. It is tempting because mismatched chart types are a genuine visualisation error, but the question asks for mistakes, and the correct answers are practices such as distorting axes or overloading a single chart.
- ✓
Using a 3D pie chart
Why this is correct
A 3D pie chart distorts segment proportions through perspective foreshortening, so viewers cannot compare slices accurately — a common visualisation error. It also wastes ink on depth that encodes no data, violating the stem's requirement to identify frequent mistakes made when creating data visualisations.
- ✗
Labeling axes clearly
Why it's wrong here
Clear axis labels are a recommended practise that prevents misreading, so they are not a mistake. It is tempting to flag them because poorly labelled axes do mislead viewers, but the question asks for errors, and the correct answers are things like truncated axes, misleading scales and unnecessary 3D effects.
- ✓
Using a non-zero baseline for bar charts
Why this is correct
A non-zero baseline truncates the bars' length encoding, so differences appear exaggerated relative to their true magnitude. Because bar charts encode value by length, the baseline must remain at zero; the stem asks for common visualisation mistakes, and this distortion qualifies directly.
- ✓
Truncating the y-axis to exaggerate differences
Why this is correct
Truncating the y-axis distorts the visual ratio between bars or lines, making minor variations appear dramatic. Because the axis no longer starts at zero, viewers misjudge true magnitude, so this counts as a common charting mistake that misleads rather than informs.
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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.