Question 1

Averages of small samples,not individual measurements,are generally used in statistical process control.

Accepted Answer

A) True 
 B)False

Question 2

What four elements determine the value of average outgoing quality?

Accepted Answer

The four elements are the true percentag

Question 3

The Cpk index measures the difference between the desired and actual dimensions of goods or services produced.

Accepted Answer

A) True 
 B)False

Question 4

A Cp value of 1.33 indicates a standard of how many standard deviations (sigmas)?

Accepted Answer

A) 6 
B) 1.33 
C) 2 
D) 3 
E) 4 
A) 6 
B) 1.33 
C) 2 
D) 3 
E) 4

Question 5

The steeper an OC curve,the better it discriminates between good and bad lots.

Accepted Answer

A) True 
 B)False

Question 6

________ is variation in a production process that can be traced to specific causes.

Accepted Answer

Assignable

Question 7

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 8

An operating characteristic (OC)curve describes:

Accepted Answer

A) how many defects per unit are permitted before rejection occurs. 
B) the sample size necessary to distinguish between good and bad lots. 
C) the most appropriate sampling plan for a given incoming product quality level. 
D) how well an acceptance sampling plan discriminates between good and bad lots. 
E) none of the above. 
A) how many defects per unit are permitted before rejection occurs. 
B) the sample size necessary to distinguish between good and bad lots. 
C) the most appropriate sampling plan for a given incoming product quality level. 
D) how well an acceptance sampling plan discriminates between good and bad lots. 
E) none of the above.

Question 9

The mean and standard deviations for a process are μ = 90 and σ = 9,respectively.For the variable control chart,a sample size of 16 will be used.Calculate the standard deviation of the sample means.

Accepted Answer

Sigma x-ba

Question 10

If the Cpk index exceeds 1:

Accepted Answer

A) the AQL must be smaller than the LTPD. 
B) σ must be less than one-third of the absolute value of the difference between each specification limit and the process mean. 
C) the x-bar chart must indicate that the process is in control. 
D) the process is capable of Six Sigma quality. 
E) the process is characterized as "not capable." 
A) the AQL must be smaller than the LTPD. 
B) σ must be less than one-third of the absolute value of the difference between each specification limit and the process mean. 
C) the x-bar chart must indicate that the process is in control. 
D) the process is capable of Six Sigma quality. 
E) the process is characterized as "not capable."

Question 11

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 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

What is the purpose of the Operating Characteristics curve?

Accepted Answer

An OC curve plots the probabil

Question 14

The ________ -chart is the chief way to control attributes.

Accepted Answer

The answer of The ________ -chart is the chief way...

Question 15

A p-chart is appropriate to plot the number of typographic errors per page of text.

Accepted Answer

A) True 
 B)False

Question 16

An x-bar chart is used when we are sampling attributes.

Accepted Answer

A) True 
 B)False

Question 17

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 18

A(n)________ is a graph that describes how well an acceptance plan discriminates between good and bad lots.

Accepted Answer

OC or oper

Question 19

A local manufacturer supplies you with parts,and you would like to install a quality monitoring system at his factory for these parts.Historically,the defect rate for these parts has been 1.25 percent (You've observed this from your acceptance sampling procedures,which you would like to discontinue).Develop ± 3σ control limits for this process.Assume the sample size will be 200 items.

Accepted Answer

p-bar is 0.0125;the standard error of th

Question 20

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

Exam 19: Statistical Process Control

Averages of small samples,not individual measurements,are generally used in statistical process control.

What four elements determine the value of average outgoing quality?

The Cpk index measures the difference between the desired and actual dimensions of goods or services produced.

A Cp value of 1.33 indicates a standard of how many standard deviations (sigmas)?

The steeper an OC curve,the better it discriminates between good and bad lots.

________ is variation in a production process that can be traced to specific causes.

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?

An operating characteristic (OC)curve describes:

The mean and standard deviations for a process are μ = 90 and σ = 9,respectively.For the variable control chart,a sample size of 16 will be used.Calculate the standard deviation of the sample means.

If the Cpk index exceeds 1:

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

Acceptance sampling is usually used to control:

What is the purpose of the Operating Characteristics curve?

The ________ -chart is the chief way to control attributes.

A p-chart is appropriate to plot the number of typographic errors per page of text.

An x-bar chart is used when we are sampling attributes.

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

A(n)________ is a graph that describes how well an acceptance plan discriminates between good and bad lots.

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.

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