Question 1

The ________ is the percentage defective in an average lot of goods inspected through acceptance sampling.

Accepted Answer

AOQ or ave

Question 2

If   = 23 ounces,σ = 0.4 ounces,and n = 16,what will be the ±3σ control limits for the x-bar chart?

Accepted Answer

A) 21.8 to 24.2 ounces 
B) 23 ounces 
C) 22.70 to 23.30 ounces 
D) 22.25 to 23.75 ounces 
E) 22.90 to 23.10 ounces 
A) 21.8 to 24.2 ounces 
B) 23 ounces 
C) 22.70 to 23.30 ounces 
D) 22.25 to 23.75 ounces 
E) 22.90 to 23.10 ounces

Question 3

A Type I error occurs when:

Accepted Answer

A) a good lot is rejected. 
B) a bad lot is accepted. 
C) the number of defectives is very large. 
D) the population is worse than the AQL. 
E) none of the above 
A) a good lot is rejected. 
B) a bad lot is accepted. 
C) the number of defectives is very large. 
D) the population is worse than the AQL. 
E) none of the above

Question 4

A Cpk index of 1.00 equates to what defect rate?

Accepted Answer

A) five percent 
B) 3.4 defects per million items 
C) 2.7 defects per 1,000 items 
D) 97.23 percent 
E) one percent 
A) five percent 
B) 3.4 defects per million items 
C) 2.7 defects per 1,000 items 
D) 97.23 percent 
E) one percent

Question 5

Control charts for variables are based on data that come from:

Accepted Answer

A) acceptance sampling. 
B) individual items. 
C) averages of small samples. 
D) averages of large samples. 
E) the entire lot. 
A) acceptance sampling. 
B) individual items. 
C) averages of small samples. 
D) averages of large samples. 
E) the entire lot.

Question 6

If the process average is in control,then the process range must also be in control.

Accepted Answer

A) True 
 B)False

Question 7

If a sample of items is taken and the mean of the sample is outside the control limits,the process is:

Accepted Answer

A) likely out of control and the cause should be investigated. 
B) in control,but not capable of producing within the established control limits. 
C) within the established control limits with only natural causes of variation. 
D) monitored closely to see if the next sample mean will also fall outside the control limits. 
E) producing high quality products. 
A) likely out of control and the cause should be investigated. 
B) in control,but not capable of producing within the established control limits. 
C) within the established control limits with only natural causes of variation. 
D) monitored closely to see if the next sample mean will also fall outside the control limits. 
E) producing high quality products.

Question 8

The process capability measures Cp and Cpk differ because:

Accepted Answer

A) only one ensures the process mean is centered within the limits. 
B) Cp values above 1 indicate a capable process,while Cpk values above 2 indicate a capable process. 
C) They do not differ: both are identical. 
D) Cp values for a given process will always be greater than or equal to Cpk values. 
E) Both A and D are correct. 
A) only one ensures the process mean is centered within the limits. 
B) Cp values above 1 indicate a capable process,while Cpk values above 2 indicate a capable process. 
C) They do not differ: both are identical. 
D) Cp values for a given process will always be greater than or equal to Cpk values. 
E) Both A and D are correct.

Question 9

Mean charts and range charts complement one another,one detecting shifts in process average,the other detecting shifts in process dispersion.

Accepted Answer

A) True 
 B)False

Question 10

An operator trainee is attempting to monitor a filling process that has an overall average of 705 cc.The average range is 17 cc.If you use a sample size of 6,what are the upper and lower control limits for the x-bar chart and R-chart?

Accepted Answer

From the table,A₂ = 0.483,D₄ = 2

Question 11

Ten samples of a process measuring the number of returns per 100 receipts were taken for a local retail store.The number of returns were 10,9,11,7,3,12,8,4,6,and 11.Find the standard deviation of the sampling distribution for the p-bar chart.

Accepted Answer

A) There is not enough information to answer the question. 
B) .081 
C) 8.1 
D) .0273 
E) .0863 
A) There is not enough information to answer the question. 
B) .081 
C) 8.1 
D) .0273 
E) .0863

Question 12

Acceptance sampling is usually used to control:

Accepted Answer

A) the number of units of output from one stage of a process that are then sent to the next stage. 
B) the number of units delivered to the customer. 
C) the quality of work-in-process inventory. 
D) incoming lots of purchased products. 
E) all of the above. 
A) the number of units of output from one stage of a process that are then sent to the next stage. 
B) the number of units delivered to the customer. 
C) the quality of work-in-process inventory. 
D) incoming lots of purchased products. 
E) all of the above.

Question 13

An acceptance sampling plan is to be designed to meet the organization's targets for product quality and risk levels.Which of the following is true?

Accepted Answer

A) n and c determine the AQL. 
B) AQL,LTPD,α and β collectively determine n and c. 
C) n and c are determined from the values of AQL and LTPD. 
D) α and β are determined from the values of AQL and LTPD. 
E) None of the above is true. 
A) n and c determine the AQL. 
B) AQL,LTPD,α and β collectively determine n and c. 
C) n and c are determined from the values of AQL and LTPD. 
D) α and β are determined from the values of AQL and LTPD. 
E) None of the above is true.

Question 14

What is the AOQ of an acceptance sampling plan?

Accepted Answer

The AOQ is the average outgoin

Question 15

What do the terms producer's risk and consumer's risk mean?

Accepted Answer

Producer's risk: the risk of r

Question 16

Define consumer's risk.Is it a Type I or Type II error? What is the symbol for its value?

Accepted Answer

The consumer's risk is the pro

Question 17

Larry's boat shop wants to monitor the number of blemishes in the paint of each boat.Construct a 3-sigma c-chart to determine if their paint process is in control using the following data.

Accepted Answer

@#IMG-DLM& @#IMG-DLM& The proc

Question 18

The specifications for a manifold gasket that installs between two engine parts calls for a thickness of 2.500 mm ± .020 mm.The standard deviation of the process is estimated to be 0.004 mm.The process is currently operating at a mean thickness of 2.50 mm.(a)What are the upper and lower specification limits for this product? (b)What is the Cp for this process? (c)The purchaser of these parts requires a capability index of 1.50.Is this process capable? Is this process good enough for the supplier? (d)If the process mean were to drift from its setting of 2.500 mm to a new mean of 2.497,would the process still be good enough for the supplier's needs?

Accepted Answer

(a)LSL = 2.48 mm,USL = 2.52 mm.(b)C_p = (2

Question 19

In acceptance sampling,a manager can reach the wrong conclusion if the sample is not representative of the population it was drawn from.

Accepted Answer

A) True 
 B)False

Question 20

A department chair wants to monitor the percentage of failing students in classes in her department.Each class had an enrollment of 50 students last spring.The number of failing students in the 10 classes offered that term were 1,4,2,0,0,0,0,0,0,and 3,respectively.Compute the control limits for a p-chart at the 95% confidence level.Is the process in control?

Accepted Answer

From Table S6.2,the z-value = 1.96.
The

Exam 19: Statistical Process Control

The ________ is the percentage defective in an average lot of goods inspected through acceptance sampling.

If = 23 ounces,σ = 0.4 ounces,and n = 16,what will be the ±3σ control limits for the x-bar chart?

A Type I error occurs when:

A Cpk index of 1.00 equates to what defect rate?

Control charts for variables are based on data that come from:

If the process average is in control,then the process range must also be in control.

If a sample of items is taken and the mean of the sample is outside the control limits,the process is:

The process capability measures Cp and Cpk differ because:

Mean charts and range charts complement one another,one detecting shifts in process average,the other detecting shifts in process dispersion.

An operator trainee is attempting to monitor a filling process that has an overall average of 705 cc.The average range is 17 cc.If you use a sample size of 6,what are the upper and lower control limits for the x-bar chart and R-chart?

Ten samples of a process measuring the number of returns per 100 receipts were taken for a local retail store.The number of returns were 10,9,11,7,3,12,8,4,6,and 11.Find the standard deviation of the sampling distribution for the p-bar chart.

Acceptance sampling is usually used to control:

An acceptance sampling plan is to be designed to meet the organization's targets for product quality and risk levels.Which of the following is true?

What is the AOQ of an acceptance sampling plan?

What do the terms producer's risk and consumer's risk mean?

Define consumer's risk.Is it a Type I or Type II error? What is the symbol for its value?

Larry's boat shop wants to monitor the number of blemishes in the paint of each boat.Construct a 3-sigma c-chart to determine if their paint process is in control using the following data.

In acceptance sampling,a manager can reach the wrong conclusion if the sample is not representative of the population it was drawn from.

Operations and Productivity

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Design of Goods and Services

Managing Quality

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Human Resources,job Design,and Work Measurement

Supply Chain Management

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A C_pk index of 1.00 equates to what defect rate?

The process capability measures C_p and C_pk differ because: