- A
The control limits need to be recalculated
Why wrong: Recalculating limits without investigation may hide the issue.
- B
The process is producing fewer defects than expected
Why wrong: Above mean indicates more defects, not fewer.
- C
A special cause variation is likely present
Correct: Seven or more consecutive points on one side of the mean indicate a special cause.
- D
The process is in control and stable
Why wrong: While no points exceed limits, a run of points above the mean signals a potential shift.
Question 120 of 1,000
PK0-005 Tools and Documentation Practice Question
This PK0-005 practice question tests your understanding of tools and documentation. 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.
A project manager is using a control chart to monitor the number of defects per day. The chart shows 10 data points within the control limits, but all 10 points are above the mean. What does this indicate?
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
✓
A special cause variation is likely present
In a control chart, a run of 10 consecutive points above the mean (center line) is a classic indicator of a non-random pattern, even if all points fall within the control limits. This violates the 'run rule' (typically 7 or more points on one side of the mean), which signals the presence of a special cause variation that should be investigated. Option C is correct because the sustained shift above the mean suggests an assignable cause is affecting the process, not random common cause variation.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 control limits need to be recalculated
Why it's wrong here
Recalculating limits without investigation may hide the issue.
- ✗
The process is producing fewer defects than expected
Why it's wrong here
Above mean indicates more defects, not fewer.
- ✓
A special cause variation is likely present
Why this is correct
Correct: Seven or more consecutive points on one side of the mean indicate a special cause.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The process is in control and stable
Why it's wrong here
While no points exceed limits, a run of points above the mean signals a potential shift.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates mistakenly believe any data point within control limits automatically means the process is stable, ignoring the run rules that detect non-random patterns like sustained shifts above or below the mean.
Detailed technical explanation
How to think about this question
Control charts rely on the central limit theorem and assume data points are independent and identically distributed. The run rule (e.g., 7 or more consecutive points on one side of the mean) is a standard test for special cause variation, as the probability of such a run occurring by chance under a stable process is extremely low (0.5^7 ≈ 0.78%). In practice, project managers use control charts to distinguish between common cause variation (inherent to the process) and special cause variation (assignable, such as a new defect-introducing change in code or a supplier issue).
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the PK0-005 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
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this PK0-005 question test?
Tools and Documentation — This question tests Tools and Documentation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A special cause variation is likely present — In a control chart, a run of 10 consecutive points above the mean (center line) is a classic indicator of a non-random pattern, even if all points fall within the control limits. This violates the 'run rule' (typically 7 or more points on one side of the mean), which signals the presence of a special cause variation that should be investigated. Option C is correct because the sustained shift above the mean suggests an assignable cause is affecting the process, not random common cause variation.
What should I do if I get this PK0-005 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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.
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