Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

The x-bar chart indicates that a gain or loss of uniformity has occurred in dispersion of a production process.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following statements about acceptance sampling is true?

Accepted Answer

A) Acceptance sampling draws a sample from a population of items,tests the sample,accepts the entire population if the sample is good enough,and rejects it if the sample is poor enough. 
B) The sampling plan contains information about the sample size to be drawn and the critical acceptance or rejection numbers for that sample size. 
C) The steeper an operating characteristic curve,the better its ability to discriminate between good and bad lots. 
D) All of the above are true. 
E) All of the above are false. 
A) Acceptance sampling draws a sample from a population of items,tests the sample,accepts the entire population if the sample is good enough,and rejects it if the sample is poor enough. 
B) The sampling plan contains information about the sample size to be drawn and the critical acceptance or rejection numbers for that sample size. 
C) The steeper an operating characteristic curve,the better its ability to discriminate between good and bad lots. 
D) All of the above are true. 
E) All of the above are false.

Question 4

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 5

Natural variations:

Accepted Answer

A) affect almost every production process. 
B) are the many sources of variation that occur when a process is under control. 
C) when grouped,form a pattern,or distribution. 
D) are tolerated,within limits,when a process is under control. 
E) All of the above are true. 
A) affect almost every production process. 
B) are the many sources of variation that occur when a process is under control. 
C) when grouped,form a pattern,or distribution. 
D) are tolerated,within limits,when a process is under control. 
E) All of the above are true.

Question 6

Examine the Statistical Process Control outputs below.Answer the following questions.
a.What is the sample size?
b.What is the number of samples?
c.What is the mean of sample 8;what is the range of sample 10?
d..Is this process in control? Explain--a simple Yes or No is insufficient.
e.What additional steps should the quality assurance team take?

Accepted Answer

a.The sample size is 4.b.ten samples wer

Question 7

In statistical process control,the range is often used as a substitute for the standard deviation.

Accepted Answer

A) True 
 B)False

Question 8

A small,independent amusement park collects data on the number of cars with out-of-state license plates.The sample size is fixed at n=25 each day.Data from the previous 10 days indicate the following number of out-of-state license plates:
   (a)Calculate the overall proportion of "tourists" (cars with out-of-state plates)and the standard deviation of proportions.
(b)Using ±3σ limits,calculate the LCL and UCL for these data.
(c)Is the process under control? Explain.

Accepted Answer

(a)p-bar is 56/250 = 0.224;the standard

Question 9

The term ________ is used to describe how well a process makes units within design specifications (or tolerances).

Accepted Answer

The answer of The term ________ is used to describe...

Question 10

A part that connects two levels should have a distance between the two holes of 4".It has been determined that x-bar and R-charts should be set up to determine if the process is in statistical control.The following ten samples of size four were collected.Calculate the control limits,plot the control charts,and determine if the process is in control.

Accepted Answer

@#IMG-DLM& @#IMG-DLM& The process is out

Question 11

Pierre's Motorized Pirogues and Mudboats is setting up an acceptance sampling plan for the special air cleaners he manufactures for his boats.His specifications,and the resulting plan,are shown on the POM for Windows output below.Pierre wants acceptance sampling to remove ALL defects from his production of air cleaners.Explain carefully why this won't happen.

Accepted Answer

Acceptance sampling is not intended to r

Question 12

Briefly explain what the Central Limit Theorem has to do with control charts.

Accepted Answer

It provides the theoretical foundation f

Question 13

A process is operating in such a manner that the mean of the process is exactly on the lower specification limit.What must be true about the two measures of capability for this process?

Accepted Answer

The Cp ratio does not consider how well

Question 14

To set x-bar chart upper and lower control limits,one must know the process central line,which is the:

Accepted Answer

A) average of the sample means. 
B) total number of defects in the population. 
C) percent defects in the population. 
D) size of the population. 
E) average range. 
A) average of the sample means. 
B) total number of defects in the population. 
C) percent defects in the population. 
D) size of the population. 
E) average range.

Question 15

A consultant has been brought in to a manufacturing plant to help apply Six Sigma principles.Her first task is to work on the production of rubber balls.The upper and lower spec limits are 21 and 19 cm,respectively.The consultant takes ten samples of size five and computes the sample standard deviation to be .7 cm and the sample mean to be 19.89 cm.Compute Cp and Cpk for the process.Give the consultant advice on what to do with the process based on your findings.

Accepted Answer

Cp = (21 - 19)/(6 ∗ .7)= .476

Question 16

Repeated sampling of a certain process shows the average of all sample ranges to be 1.0 cm.The sample size has been constant at n = 5.What are the 3-sigma control limits for this R-chart?

Accepted Answer

LCL = 0,an

Question 17

Which of the following is true of a p-chart?

Accepted Answer

A) The lower control limit is found by subtracting a fraction from the average number of defects. 
B) The lower control limit indicates the minimum acceptable number of defects. 
C) The lower control limit equals D3 times p-bar. 
D) The lower control limit may be at zero. 
E) The lower control limit is the same as the lot tolerance percent defective. 
A) The lower control limit is found by subtracting a fraction from the average number of defects. 
B) The lower control limit indicates the minimum acceptable number of defects. 
C) The lower control limit equals D3 times p-bar. 
D) The lower control limit may be at zero. 
E) The lower control limit is the same as the lot tolerance percent defective.

Question 18

When a lot has been accepted by acceptance sampling,we know that:

Accepted Answer

A) it has more defects than existed before the sampling. 
B) it has had all its defects removed by 100% inspection. 
C) it will have the same defect percentage as the LTPD. 
D) it has no defects present. 
E) All of the above are false. 
A) it has more defects than existed before the sampling. 
B) it has had all its defects removed by 100% inspection. 
C) it will have the same defect percentage as the LTPD. 
D) it has no defects present. 
E) All of the above are false.

Question 19

What is the basic objective of a process control system?

Accepted Answer

It is to provide a s

Question 20

A manager wishes to build a 3-sigma range chart for a process.The sample size is five,the mean of sample means is 16.01,and the average range is 5.3.From Table S6.1,the appropriate value of D3 is 0,and D4 is 2.115.What are the UCL and LCL,respectively,for this range chart?

Accepted Answer

A) 33.9 and 11.2 
B) 33.9 and 0 
C) 11.2 and 0 
D) 6.3 and 0 
E) 31.91 and 0.11 
A) 33.9 and 11.2 
B) 33.9 and 0 
C) 11.2 and 0 
D) 6.3 and 0 
E) 31.91 and 0.11

Exam 19: Statistical Process Control

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

The x-bar chart indicates that a gain or loss of uniformity has occurred in dispersion of a production process.

Which of the following statements about acceptance sampling is true?

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

Natural variations:

In statistical process control,the range is often used as a substitute for the standard deviation.

The term ________ is used to describe how well a process makes units within design specifications (or tolerances).

Briefly explain what the Central Limit Theorem has to do with control charts.

A process is operating in such a manner that the mean of the process is exactly on the lower specification limit.What must be true about the two measures of capability for this process?

To set x-bar chart upper and lower control limits,one must know the process central line,which is the:

Repeated sampling of a certain process shows the average of all sample ranges to be 1.0 cm.The sample size has been constant at n = 5.What are the 3-sigma control limits for this R-chart?

Which of the following is true of a p-chart?

When a lot has been accepted by acceptance sampling,we know that:

What is the basic objective of a process control system?

A manager wishes to build a 3-sigma range chart for a process.The sample size is five,the mean of sample means is 16.01,and the average range is 5.3.From Table S6.1,the appropriate value of D3 is 0,and D4 is 2.115.What are the UCL and LCL,respectively,for this range chart?

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