PK0-005 Tools and Documentation Practice Question
A project manager is analyzing quality data and wants to identify the most frequently occurring defects to prioritize corrective actions. Which quality tool should be used?
⚠ Common exam trap
A common mix-up: candidates confuse the histogram (which shows frequency distribution of one variable) with the Pareto chart (which ranks categorical defects by frequency and adds cumulative percentage) — candidates pick histogram because both display bars.
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
✓
Pareto chart
A Pareto chart is the correct tool because it combines a bar chart of defect frequencies (ordered from highest to lowest) with a cumulative percentage line, directly applying the 80/20 principle to identify the 'vital few' defect categories that cause most problems. This makes it purpose-built for prioritizing corrective actions based on frequency of occurrence.
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 continuous data across ranges, showing shape and spread rather than ranked defect categories. It tempts because it visualises frequency, and would be correct when assessing whether a process measurement follows a normal distribution.
- ✗
Scatter diagram
Why it's wrong here
A scatter diagram plots two variables to reveal correlation between them, so it cannot rank defect categories by frequency. It tempts because it is a recognised quality tool used for cause-and-effect analysis, and would be correct when testing whether one process variable influences another.
- ✓
Pareto chart
Why this is correct
A Pareto chart ranks defect categories by descending frequency, applying the 80/20 principle so the few defect types causing most occurrences stand out. This directly satisfies the stem's need to prioritise corrective actions on the most frequently occurring defects.
- ✗
Control chart
Why it's wrong here
A control chart tracks a process over time against control limits to detect special-cause variation, not defect frequency counts. It tempts because it is a core quality tool, and would be correct when determining whether a process is stable or drifting out of statistical control.
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JA
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 PK0-005 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 PK0-005 exam.