What QA procedure permits inspection of only a representative sample of a product?

What QA procedure permits inspection of only a representative sample of a product?

• A. Statistical sampling
• B. Final sampling
• C. Random testing
• D. Spot checking

Answer: (A)

Using statistical sampling lets you inspect a representative subset and draw conclusions about the entire batch. By following a defined sampling plan that specifies how many units to test, what results are acceptable, and the confidence level you require, you can determine whether the whole production run meets quality goals without checking every item. This approach reduces time and cost while maintaining an auditable basis for decision-making, because the sample is chosen and evaluated in a way that reflects the lot’s characteristics and quantifies the risk of making an incorrect decision. Other methods lack this rigorous, probabilistic framework: inspecting only at the end or relying on ad-hoc checks doesn’t guarantee representativeness, and informal spot checks can miss defects or biases.

Using statistical sampling lets you inspect a representative subset and draw conclusions about the entire batch. By following a defined sampling plan that specifies how many units to test, what results are acceptable, and the confidence level you require, you can determine whether the whole production run meets quality goals without checking every item. This approach reduces time and cost while maintaining an auditable basis for decision-making, because the sample is chosen and evaluated in a way that reflects the lot’s characteristics and quantifies the risk of making an incorrect decision. Other methods lack this rigorous, probabilistic framework: inspecting only at the end or relying on ad-hoc checks doesn’t guarantee representativeness, and informal spot checks can miss defects or biases.