Statistical Sampling Flashcards
7 cards from real Quality Auditor Certification practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Statistical Sampling flashcards as text
In ANSI/ASQ Z1.4, what happens to the sampling plan when a lot is submitted under tightened inspection and a second lot is rejected?
Answer: Acceptance of product is discontinued until corrective action is taken
Under Z1.4, if five consecutive lots are rejected on tightened inspection, acceptance of the product must be discontinued.
A quality engineer applies a hypergeometric distribution rather than a binomial distribution when sampling. This choice is most appropriate when:
Answer: The sample is a significant fraction of a finite population
The hypergeometric distribution applies when sampling without replacement from a finite population where the sample is a substantial fraction.
Average Total Inspection (ATI) in acceptance sampling includes which components?
Answer: Sample items plus all items in rejected lots that are 100% inspected
ATI accounts for sample inspection plus the full 100% inspection of all rejected lots after they are screened.
Which of the following best describes the Lot Tolerance Percent Defective (LTPD)?
Answer: The defect rate at which there is a 10% probability of acceptance (consumer's risk point)
LTPD is the defect level at which the probability of lot acceptance equals the consumer's risk (typically 10%).
A double sampling plan with n1=50, c1=1, r1=4, n2=100, c2=3 means a lot is accepted outright if the first sample yields:
Answer: 1 or fewer defectives
In a double sampling plan, the lot is accepted after the first sample if defectives found are ≤ c1 (1 in this case).
When using variables sampling plans (such as ANSI/ASQ Z1.9), what assumption about the data is required?
Answer: Measurements must come from a normally distributed population
Variables sampling plans assume normality because they use the mean and standard deviation to estimate the fraction defective.
Rectifying inspection refers to a sampling procedure where:
Answer: Defectives found in samples and rejected lots are replaced with conforming units
Rectifying inspection replaces detected defectives, so the outgoing quality is always better than the incoming lot quality.
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