PK0-005 Tools and Documentation Practice Question
A project manager is using a control chart to monitor quality. The data points fall within the control limits but show a run of seven points 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
✓
Special cause variation is present
A run of seven or more points on one side of the mean is a rule for identifying special cause variation, even if within control limits.
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 adjustment
Why it's wrong here
Control limits derive from process data and are not recalculated merely because points cluster on one side of the mean; a seven-point run signals an assignable cause. Limits would be revisited only when the process itself changes, such as after a documented improvement or new equipment.
- ✗
Common cause variation only
Why it's wrong here
Common cause variation describes random dispersion within the limits with no pattern; a seven-point run above the mean is a non-random signal indicating special cause variation. This option would be correct if the points were scattered evenly around the mean without any sustained shift.
- ✓
Special cause variation is present
Why this is correct
Seven consecutive points on one side of the mean is a non-random pattern, so the process is not in statistical control. Control limits are not breached, but this run signals special cause variation that warrants investigation rather than common cause adjustment.
- ✗
The process is out of control
Why it's wrong here
While not out of control in terms of limits, the run indicates special cause variation that needs investigation.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.