ASQ Certified Quality Auditor (CQA) — Question 1

An auditor is performing an audit of a drilling machine that produces 100 pieces a day and that is showing improved quality. Which of the following rules should be used for determining the proper sample size for a fixed level of confidence?

Answer options

• A. The moving average should be calculated.
• B. The sample size should be decreased as the quality improves.
• C. The AQL of the raw material should be used.
• D. A 10% sample size should be used, regardless of the change in quality.

Correct answer: B

Explanation

Option B is correct because as the quality of the production improves, it is typically acceptable to reduce the sample size needed to maintain the same level of confidence. Options A, C, and D are incorrect as they do not consider the effect of improved quality on the necessity for sample size adjustments.