CQI Sampling Plans & Acceptance Sampling

Question 1

What does AQL stand for in acceptance sampling per ANSI/ASQ Z1.4?

Accepted Answer

Acceptance Quality Limit

Answer

AQL stands for Acceptance Quality Limit, defined as the quality level that is the worst tolerable process average when a continuing series of lots is submitted for acceptance sampling.

Question 2

In a single sampling plan, a lot is rejected when the number of defectives found in the sample is:

Accepted Answer

Greater than the acceptance number (Ac)

Answer

A lot is rejected when the number of defectives exceeds the acceptance number (Ac), meaning the rejection number (Re) is typically Ac + 1.

Question 3

The Operating Characteristic (OC) curve of a sampling plan illustrates the relationship between:

Accepted Answer

Probability of lot acceptance and incoming lot quality

Answer

The OC curve plots the probability of accepting a lot (Pa) against the actual lot fraction defective, showing how well the sampling plan discriminates between good and bad lots.

Question 4

The producer's risk (α) in acceptance sampling is the probability of:

Accepted Answer

Rejecting a lot that meets the AQL

Answer

Producer's risk (α) is the probability that a good lot meeting the AQL is incorrectly rejected, representing the risk borne by the supplier.

Question 5

In acceptance sampling, the AQL represents:

Accepted Answer

The worst average process quality level still considered acceptable

Answer

The AQL is the worst tolerable process average quality level for a continuing series of lots; lots at AQL quality have a high probability of acceptance.

CQI - Certified Quality Inspector Practice Test

CQI - Certified Quality Inspector Practice Test

CQI Sampling Plans & Acceptance Sampling