CQI Sampling Plans & Acceptance Sampling 3

Question 1

Skip-lot sampling is most appropriately applied when:

Accepted Answer

A supplier has demonstrated consistently high quality over an extended period

Answer

A supplier has a history of poor quality requiring closer oversight

Answer

The lot size is too small for conventional sampling

Answer

The product is safety-critical and requires 100% inspection

Question 2

In sequential sampling, after inspecting each item the inspector makes a decision to:

Accepted Answer

Accept the lot, reject the lot, or continue sampling

Answer

Inspect a fixed additional batch before deciding

Answer

Switch to a double sampling plan

Answer

Return the item to the lot regardless of outcome

Question 3

Average Total Inspection (ATI) is a metric that measures:

Accepted Answer

The average number of units inspected per lot, including 100% inspection of rejected lots under rectifying inspection

Answer

The total inspection labor hours expended per fiscal year

Answer

The average fraction defective across all lots received

Answer

The time in hours to complete one full inspection cycle

Question 4

Under ANSI/ASQ Z1.4, the inspection level primarily determines:

Accepted Answer

The relationship between lot or batch size and sample size

Answer

The AQL value to apply to the inspection

Answer

The number of defect classifications used

Answer

The switching rules between normal and tightened inspection

Question 5

A Type A OC curve differs from a Type B OC curve in that Type A applies to:

Accepted Answer

Isolated lots, while Type B applies to a continuing series of lots from an ongoing process

Answer

Variables data, while Type B applies to attributes data

Answer

Tightened inspection, while Type B applies to normal inspection

Answer

AQL values above 1.0%, while Type B applies to AQL values at or below 1.0%

Question 6

In a variables acceptance sampling plan using the k-method, a lot is accepted when:

Accepted Answer

The sample mean is at least k standard deviations away from the nearest specification limit

Answer

The fraction defective estimate is less than the AQL

Answer

The range of measurements is within k times the process standard deviation

Answer

The standard deviation of the sample is less than k times the tolerance

Question 7

Chain sampling (ChSP-1) allows a lot with one defective item to be accepted if:

Accepted Answer

The preceding 'i' samples each had zero defectives

Answer

The previous sample also contained exactly one defective

Answer

The lot size exceeds a specified minimum threshold

Answer

The single defective is classified as a minor defect only