Quality Auditor Certification Statistical Sampling 5

Question 1

In a variables sampling plan using the k-method, acceptance occurs when the quality statistic k satisfies which condition?

Accepted Answer

k is greater than or equal to the acceptance constant k_a

Answer

In the k-method, the quality statistic k = (X̄ - L)/s (or similar) must meet or exceed k_a to indicate the process is sufficiently far from the specification limit.

Question 2

What is the primary reason acceptance sampling does NOT improve quality?

Accepted Answer

It only sorts defective product from conforming product rather than preventing defects

Answer

Acceptance sampling is a screening tool, not a prevention tool; defects must already exist in the lot for sampling to detect them.

Question 3

A quality auditor selects General Inspection Level II in ANSI/ASQ Z1.4. Compared to Level I, Level II provides:

Accepted Answer

Larger sample sizes with better discrimination between good and bad lots

Answer

Level II uses larger samples than Level I, providing a steeper OC curve and better ability to discriminate between acceptable and rejectable lots.

Question 4

In sequential probability ratio testing (SPRT), inspection continues until:

Accepted Answer

Cumulative evidence reaches an accept or reject boundary

Answer

SPRT compares cumulative likelihood ratios against accept/reject boundaries, stopping as soon as sufficient evidence accumulates.

Question 5

When the incoming lot quality is very good (near zero defects), the AOQ value is approximately:

Accepted Answer

Near zero, because most lots are accepted and contain very few defects

Answer

When incoming quality is near zero, outgoing quality is also near zero because the few accepted lots contain almost no defectives.

Quality Auditor Certification Practice Test

Quality Auditor Certification Practice Test

Quality Auditor Certification Statistical Sampling 5