Question 1

A double-sampling plan has a lower ________ than a single-sampling plan.

Accepted Answer

ANI
average number of items inspected

Question 2

Which one of the following actions will decrease the producer's risk?

Accepted Answer

A)  Increase n and keep c constant. 
B)  Decrease n and keep c constant. 
C)  Keep n constant and decrease c. 
D)  Increase n and decrease c. 
A)  Increase n and keep c constant. 
B)  Decrease n and keep c constant. 
C)  Keep n constant and decrease c. 
D)  Increase n and decrease c. B

Question 3

A single-sampling plan using a sample size of 50 on a lot size of 2,000 has the following performance:
$$\begin{array} { | c | c | } 
\hline \begin{array} { c } 
\text { Proportion } \
\text { Defective }
\end{array} & \begin{array} { c } 
\text { Probability of } \
\text { Acceptance }
\end{array} \
\hline 0.01 & 0.98 \
\hline 0.02 & 0.95 \
\hline 0.03 & 0.90 \
\hline 0.04 & 0.74 \
\hline 0.05 & 0.41 \
\hline 0.06 & 0.15 \
\hline
\end{array}$$
Today the company making the purchase receives two lots of 2,000 items and the inspection department is in a big hurry.Which action will result in an identical AOQL for the purchasing company?

Accepted Answer

A)  Take a random sample of 25 from each lot and accept or reject both lots based on the results. 
B)  Take a random sample of 50 from one lot and accept or reject the second lot based on the first lot's results. 
C)  Take a random sample of 100 from one lot and accept or reject the second lot based on the first lot's results. 
D)  Take a random sample of 50 from each lot and accept or reject each lot based on the results. 
A)  Take a random sample of 25 from each lot and accept or reject both lots based on the results. 
B)  Take a random sample of 50 from one lot and accept or reject the second lot based on the first lot's results. 
C)  Take a random sample of 100 from one lot and accept or reject the second lot based on the first lot's results. 
D)  Take a random sample of 50 from each lot and accept or reject each lot based on the results. D

Question 4

Champion Cooling Company has developed a sampling plan calling for a sample size of 25 and an acceptance number of 1.The proportion defective and probability of acceptance appear in the table.Floyd Electric,their supplier ships whatever Champion Cooling asks; sometimes the lot size is as small as 30 units and it has been as large as 10,000 units.Champion Cooling decides to stick with what they know,a sample size of 25 and an acceptance number of 1 despite advice to the contrary.Which statement regarding their sampling plan is best?
$$\begin{array} { | c | c | } 
\hline \mathbf { p } & \mathbf { P a } \
\hline 0.01 & 0.9980 \
\hline 0.02 & 0.9868 \
\hline 0.03 & 0.9620 \
\hline 0.04 & 0.9235 \
\hline 0.05 & 0.8729 \
\hline 0.06 & 0.8129 \
\hline 0.07 & 0.7466 \
\hline 0.08 & 0.6768 \
\hline 0.09 & 0.6063 \
\hline 0.10 & 0.5371 \
\hline
\end{array}$$

Accepted Answer

A)  The average outgoing quality level will remain constant since the sample size and the acceptance number do not change. 
B)  The average outgoing quality level will vary as the lot size varies, but the average outgoing quality limit will remain constant. 
C)  The incoming fraction defective that produces the average outgoing quality limit will remain the same regardless of lot size. 
D)  The incoming fraction defective that produces the average outgoing quality limit will vary as the lot size varies. 
A)  The average outgoing quality level will remain constant since the sample size and the acceptance number do not change. 
B)  The average outgoing quality level will vary as the lot size varies, but the average outgoing quality limit will remain constant. 
C)  The incoming fraction defective that produces the average outgoing quality limit will remain the same regardless of lot size. 
D)  The incoming fraction defective that produces the average outgoing quality limit will vary as the lot size varies.

Question 5

________ is an inspection procedure used to determine whether to accept or reject a specific quantity of material.

Accepted Answer

The answer of ________ is an inspection procedure used to...

Question 6

A rectified inspection plan requires that

Accepted Answer

A)  a rejected lot be returned to the supplier. 
B)  a rejected lot be subjected to 100% inspection. 
C)  a sample with too many defectives be returned to the lot for mixing and resampling. 
D)  all units in the sample be returned to the lot if it is rejected. 
A)  a rejected lot be returned to the supplier. 
B)  a rejected lot be subjected to 100% inspection. 
C)  a sample with too many defectives be returned to the lot for mixing and resampling. 
D)  all units in the sample be returned to the lot if it is rejected.

Question 7

A single-sampling plan using a sample size of 50 has the following performance:
$$\begin{array} { | c | c | } 
\hline \begin{array} { c } 
\text { Proportion } \
\text { Defective }
\end{array} & \begin{array} { c } 
\text { Probability of } \
\text { Acceptance }
\end{array} \
\hline 0.01 & 0.98 \
\hline 0.02 & 0.95 \
\hline 0.03 & 0.90 \
\hline 0.04 & 0.74 \
\hline 0.05 & 0.41 \
\hline 0.06 & 0.15 \
\hline
\end{array}$$
If the plan is used on a lot of 2,000 items,what is the average outgoing quality limit?

Accepted Answer

A)  Less than or equal to 0.0240 
B)  Greater than 0.0240 but less than or equal to 0.0260 
C)  Greater than 0.0260 but less than or equal to 0.0280 
D)  Greater than 0.0280 
A)  Less than or equal to 0.0240 
B)  Greater than 0.0240 but less than or equal to 0.0260 
C)  Greater than 0.0260 but less than or equal to 0.0280 
D)  Greater than 0.0280

Question 8

The AOQ is often lower for a supplier with a high fraction defective than for a supplier with a comparatively lower fraction defective.Why wouldn't a supplier with a lower fraction defective always have a better AOQ?

Accepted Answer

Average outgoing quality is based on the

Question 9

Use Table I.1 for the following question.What is the acceptance number of a single-sampling plan if n = 300,LPTD = 0.02,and ? = 0.15?

Accepted Answer

A)  c = 0 
B)  c = 1 
C)  c = 2 
D)  c = 3 
A)  c = 0 
B)  c = 1 
C)  c = 2 
D)  c = 3

Question 10

A lot of 2,000 items has just arrived.A single sampling calls for a sample size of 100 and c = 3.What is the average outgoing quality limit,assuming that all defectives in the entire lot are replaced if it is rejected and all defectives are replaced in the sample if it is accepted? Table I.1 is appended to this exam.

Accepted Answer

A)  Less than or equal to 0.0150 
B)  Greater than 0.0150 but less than or equal to 0.0175 
C)  Greater than 0.0175 but less than or equal to 0.0200 
D)  Greater than 0.0200 
A)  Less than or equal to 0.0150 
B)  Greater than 0.0150 but less than or equal to 0.0175 
C)  Greater than 0.0175 but less than or equal to 0.0200 
D)  Greater than 0.0200

Question 11

Which one of the following alternatives will reduce the producer's risk for a given AQL and LTPD?

Accepted Answer

A)  Reduce n and keep c constant. 
B)  Increase n and keep c constant. 
C)  Increase n and reduce c. 
D)  Increase alpha. 
A)  Reduce n and keep c constant. 
B)  Increase n and keep c constant. 
C)  Increase n and reduce c. 
D)  Increase alpha.

Question 12

Increasing c while holding n constant decreases the ________ risk and increases the ________ risk.

Accepted Answer

producer's

Question 13

A double-sampling plan has n? = 50,n? = 100,c? = 2,and c? = 4.Suppose the first sample revealed two defectives.What should be done?

Accepted Answer

A)  Reject the entire lot. 
B)  Take a second sampling of 100 units. 
C)  Accept the entire lot. 
D)  Repeat the tests on the first sample. 
A)  Reject the entire lot. 
B)  Take a second sampling of 100 units. 
C)  Accept the entire lot. 
D)  Repeat the tests on the first sample.

Question 14

An item is purchased with one surface polished to a specified finish quality.From each incoming shipment,a sample of items is randomly selected and the polished surface of each sample item is compared with a standard and judged to be either acceptable or unacceptable.The following parameters have been established: AQL = 0.02,= 0.05,LTPD = 0.09,and = 0.10.Table I.1 is appended to this exam.What are the sample size and the acceptance number?

Accepted Answer

A)  n = 89, c = 4 
B)  n = 39, c = 1 
C)  n = 43, c = 1 
D)  n = 237, c = 15 
A)  n = 89, c = 4 
B)  n = 39, c = 1 
C)  n = 43, c = 1 
D)  n = 237, c = 15

Question 15

Acceptance sampling is an inspection procedure used to determine whether to accept or reject a specific quantity of material.

Accepted Answer

A) True 
 B)False

Question 16

A single-sampling plan has n = 200 and c = 6.A sample is taken and five items are found to be defective.What should be done?

Accepted Answer

A)  Another sample should be taken. 
B)  The lot should be rejected. 
C)  The lot should be accepted. 
D)  The five items should be repaired, and then the entire lot should be accepted. 
A)  Another sample should be taken. 
B)  The lot should be rejected. 
C)  The lot should be accepted. 
D)  The five items should be repaired, and then the entire lot should be accepted.

Question 17

$$\begin{array} { | c | c | c | } 
\hline n & \begin{array} { c } 
\text { Producer's } \
\text { Risk } \
( p = \mathrm { AQL } )
\end{array} & \begin{array} { c } 
\text { Consumer's } \
\text { Risk } \
( p = \mathrm { LTPD } )
\end{array} \
\hline 60 & 0.122 & 0.126 \
80 & 0.191 & 0.048 \
100 & 0.264 & 0.017 \
120 & 0.332 & 0.006 \
\hline
\end{array}$$
-A quality manager has established a sampling plan that calls for a sample size of 200 units and an acceptance number of 3.The supplier has agreed to a contract that calls for an AQL of 0.01 and an LTPD of .03.What is the producer's risk? Table I.1 is appended to this exam.

Accepted Answer

A)  More than 0.14 
B)  Between 0.14 and 0.12 
C)  Between 0.12 and 0.10 
D)  Less than 0.10 
A)  More than 0.14 
B)  Between 0.14 and 0.12 
C)  Between 0.12 and 0.10 
D)  Less than 0.10

Question 18

________ is the quality level desired by the consumer.

Accepted Answer

Acceptable

Question 19

If you were interested in minimizing the average number of items inspected,which sampling plan would you choose? Why?

Accepted Answer

The sequential sampling plan m

Question 20

The chance that perfectly good material will be rejected based on a sample is known as a type I error.

Accepted Answer

A) True 
 B)False

A double-sampling plan has a lower ________ than a single-sampling plan.

Which one of the following actions will decrease the producer's risk?

________ is an inspection procedure used to determine whether to accept or reject a specific quantity of material.

A rectified inspection plan requires that

A single-sampling plan using a sample size of 50 has the following performance: Proportion Defective Probability of Acceptance 0.01 0.98 0.02 0.95 0.03 0.90 0.04 0.74 0.05 0.41 0.06 0.15 If the plan is used on a lot of 2,000 items,what is the average outgoing quality limit?

The AOQ is often lower for a supplier with a high fraction defective than for a supplier with a comparatively lower fraction defective.Why wouldn't a supplier with a lower fraction defective always have a better AOQ?

Use Table I.1 for the following question.What is the acceptance number of a single-sampling plan if n = 300,LPTD = 0.02,and ? = 0.15?

Which one of the following alternatives will reduce the producer's risk for a given AQL and LTPD?

Increasing c while holding n constant decreases the risk and increases the risk.

A double-sampling plan has n? = 50,n? = 100,c? = 2,and c? = 4.Suppose the first sample revealed two defectives.What should be done?

Acceptance sampling is an inspection procedure used to determine whether to accept or reject a specific quantity of material.

A single-sampling plan has n = 200 and c = 6.A sample is taken and five items are found to be defective.What should be done?

________ is the quality level desired by the consumer.

If you were interested in minimizing the average number of items inspected,which sampling plan would you choose? Why?

The chance that perfectly good material will be rejected based on a sample is known as a type I error.

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Inventory Management

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Lean Systems

Managing Projects

Location and Layout

Managing Demand and Forecasting

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Exam 18: Acceptance Sampling Plans

A double-sampling plan has a lower ________ than a single-sampling plan.

Which one of the following actions will decrease the producer's risk?

________ is an inspection procedure used to determine whether to accept or reject a specific quantity of material.

A rectified inspection plan requires that

A single-sampling plan using a sample size of 50 has the following performance: Proportion Defective Probability of Acceptance 0.01 0.98 0.02 0.95 0.03 0.90 0.04 0.74 0.05 0.41 0.06 0.15 If the plan is used on a lot of 2,000 items,what is the average outgoing quality limit?

The AOQ is often lower for a supplier with a high fraction defective than for a supplier with a comparatively lower fraction defective.Why wouldn't a supplier with a lower fraction defective always have a better AOQ?

Use Table I.1 for the following question.What is the acceptance number of a single-sampling plan if n = 300,LPTD = 0.02,and ? = 0.15?

Which one of the following alternatives will reduce the producer's risk for a given AQL and LTPD?

Increasing c while holding n constant decreases the ________ risk and increases the ________ risk.

A double-sampling plan has n? = 50,n? = 100,c? = 2,and c? = 4.Suppose the first sample revealed two defectives.What should be done?

Acceptance sampling is an inspection procedure used to determine whether to accept or reject a specific quantity of material.

A single-sampling plan has n = 200 and c = 6.A sample is taken and five items are found to be defective.What should be done?

________ is the quality level desired by the consumer.

If you were interested in minimizing the average number of items inspected,which sampling plan would you choose? Why?

The chance that perfectly good material will be rejected based on a sample is known as a type I error.

Creating Customer Value through Operations

Supply Chain Management

Process Configuration

Capacity

Inventory Management

Quality and Process Improvement

Lean Systems

Managing Projects

Location and Layout

Managing Demand and Forecasting

Operations Planning and Scheduling

Resource Planning

Decision Making

Financial Analysis

Work Measurement

Learning Curve Analysis

Computer-Integrated Manufacturing

Simulation

Special Inventory Models

Linear Programming

Waiting Lines

Filters

Increasing c while holding n constant decreases the risk and increases the risk.