CPP Quality Assurance & Improvement 2 — Questions and Answers
Question 1: Which statistical tool is used to identify the few causes responsible for the majority of defects in a packaging process?
- Pareto chart (Correct answer)
- Scatter diagram
- Run chart
- Affinity diagram
Correct answer: Pareto chart
A Pareto chart applies the 80/20 rule to rank defect causes by frequency, highlighting the vital few that drive most problems.
Question 2: In a packaging quality system, a 'control limit' differs from a 'specification limit' in that control limits are:
- Calculated from process data and reflect natural variation (Correct answer)
- Set by the customer to define acceptable product range
- Always wider than specification limits
- Established by regulatory agencies
Correct answer: Calculated from process data and reflect natural variation
Control limits are derived statistically from process performance data, while specification limits are externally defined requirements.
Question 3: A packaging line produces seal strength measurements that follow a normal distribution with mean 12 N and standard deviation 1 N. What percentage of seals fall between 10 N and 14 N?
- 95.4% (Correct answer)
- 68.3%
- 99.7%
- 50.0%
Correct answer: 95.4%
Values within ±2 standard deviations of the mean encompass approximately 95.4% of a normal distribution.
Question 4: Which acceptance sampling standard is most commonly referenced in the US packaging industry for attribute inspection?
- ANSI/ASQ Z1.4 (Correct answer)
- ISO 9001
- ASTM D4169
- MIL-STD-1916
Correct answer: ANSI/ASQ Z1.4
ANSI/ASQ Z1.4 provides sampling procedures and tables for inspection by attributes and is widely used in US packaging QA.
Question 5: What does the term 'AQL' stand for in the context of packaging quality inspection?
- Acceptable Quality Level (Correct answer)
- Average Quality Limit
- Attribute Quality Label
- Assured Quality Level
Correct answer: Acceptable Quality Level
AQL (Acceptable Quality Level) is the maximum defect percentage that can be considered satisfactory as a process average.
Question 6: A corrective action in a CAPA system is best described as an action taken to:
- Eliminate the root cause of a detected nonconformity (Correct answer)
- Prevent a potential nonconformity before it occurs
- Quarantine defective packaging materials
- Update customer specifications
Correct answer: Eliminate the root cause of a detected nonconformity
Corrective action addresses the root cause of an existing nonconformity to prevent recurrence, distinguishing it from preventive action.
Question 7: Which of the following best describes 'mistake-proofing' (poka-yoke) in a packaging operation?
- A mechanism that makes it impossible or immediately obvious when an error occurs (Correct answer)
- A checklist operators complete before starting a shift
- A statistical method for setting control limits
- An audit process for verifying supplier quality
Correct answer: A mechanism that makes it impossible or immediately obvious when an error occurs
Poka-yoke devices physically prevent errors or provide immediate feedback so defects cannot be passed along the packaging line.
CPP Quality Assurance & Improvement 2
Which statistical tool is used to identify the few causes responsible for the majority of defects in a packaging process?