Acceptance Sampling Basics

Question 1

Which of the following standards is used for variable sampling?

A. ANSI/ASQ Z1.9
B. ANSI/ASQ Z1.4
C. MIL-STD-105
D. Dodge-Romig LTPD-based plan

Answer 1

A. ANSI/ASQ Z1.9

ANSVASQ Z1.9 (formerly MIL-STD-414) is used for variable sampling, whereas ANSI/ASQ Z14 is used for attribute sampling.

Question 2

Which of the following replaced mil-std-105 after it was withdrawn

A. Dodge – romig aoql-based plan
B. ANSI/asq1.9
C. ANSI/asq z1.4
D. MIL-Std-414

Answer 2

C. ANSI/ASQ Z1.4

Mil-Std-105 was withdrawn and replaced by ANSI/asq Z1.4 which continues to be used for attribute sampling

Question 3

If the aql is set at 1.5%. what does this mean

A. Lots with 1.5% defectives are always rejected
B. Lots with 1.5% or fewer defective units are generally accepted
C. 1.5% of defective units are removed from the lot
D. The sample size does not matter and acceptance decisions

Answer 3

B. Lots with 1.5% or fewer defective units are generally accepted

AQL equals 1.5% means we accept lots with defect rates of 1.5% or lower and reject those above this threshold

Question 4

What happens if a lot’s defect rate is lower than the aql?

A. The lot is usually accepted
B. The lot is automatically accepted
C. The sample size must be increased
D. The entire lot must be inspected

Answer 4

A. The lot is usually accepted

Lots with defect rates lower than that AQL are generally accepted under acceptance sampling procedures

Question 5

What is another term for a rejectable quality limit? Rql

A. Average outgoing quality limit (aoql)
B. Producers risk (alpha)
C. Acceptable quality limit (aql)
D. Lot Tolerance percent defective (ltpd)

Answer 5

D. Lot tolerance percent defective (ltpd)

RQL or LTPD is the defect Ray that is considered unacceptable and should be rejected most of the time

Question 6

What does the rql of 8% with consumers risk beta of 10% mean?

A. There’s a 10% chance of rejecting a perfect lot
B. Lots with a percent defects are always accepted
C. There’s a 10% chance of accepting a lot with a percent defects
D. Only a% of the lots will be inspected

Answer 6

C. There’s a 10% chance of accepting a lot with 8% defects

QL equals 8% with beta equals 10% means we would accept lots with 8% defects, only 10% of the time