Quality Auditor Certification Statistical Sampling 4

Question 1

The Average Outgoing Quality (AOQ) curve reaches a maximum value called AOQL. What does the AOQL represent?

Accepted Answer

The worst average outgoing quality that can result from a rectifying inspection plan

Answer

The AOQL is the peak of the AOQ curve, representing the maximum long-run average fraction defective in outgoing product.

Question 2

In cluster sampling, the sampling unit is:

Accepted Answer

A naturally occurring group, with all or a random subset of items within selected groups inspected

Answer

Cluster sampling selects groups (clusters) randomly and then inspects all or a sample of items within each selected cluster.

Question 3

A quality auditor finds that a supplier consistently submits lots near the AQL. Under ANSI/ASQ Z1.4, which inspection level is appropriate once a good track record is established?

Accepted Answer

Reduced inspection

Answer

Reduced inspection is triggered after a specified number of consecutive lots pass under normal inspection, rewarding consistent quality.

Question 4

The central limit theorem is important in quality sampling because it states that:

Accepted Answer

The distribution of sample means approaches normality as sample size increases, regardless of population shape

Answer

The CLT guarantees that sample means are approximately normally distributed for large n, enabling use of normal-based inference.

Question 5

Producer's risk (α) in acceptance sampling is typically set at 5%. This means:

Accepted Answer

There is a 5% chance of rejecting a lot at the AQL quality level

Answer

Alpha (α) is the probability that a lot meeting the AQL is incorrectly rejected, penalizing the producer.

Quality Auditor Certification Practice Test

Quality Auditor Certification Practice Test

Quality Auditor Certification Statistical Sampling 4