Question 1

The usual purpose of an R-chart is to signal whether there has been a:

Accepted Answer

A) gain or loss in dispersion. 
B) change in the percent defective in a sample. 
C) change in the central tendency of the process output. 
D) change in the number of defects in a sample. 
E) change in the consumer's risk. 
A) gain or loss in dispersion. 
B) change in the percent defective in a sample. 
C) change in the central tendency of the process output. 
D) change in the number of defects in a sample. 
E) change in the consumer's risk.

Question 2

McDaniel Shipyards wants to develop a control chart to assess the quality of its steel plate.They take ten sheets of 1" steel plate and compute the number of cosmetic flaws on each roll.Each sheet is 20' by 100'.Based on the following data,develop limits for the 3-sigma control chart,plot the control chart,and determine whether the process is in control.

Accepted Answer

@#IMG-DLM& @#IMG-DLM& Sample six is abov

Question 3

Which of the following is true regarding the relationship between AOQ and the true population percent defective?

Accepted Answer

A) AOQ is greater than the true percent defective. 
B) AOQ is the same as the true percent defective. 
C) AOQ is less than the true percent defective. 
D) There is no relationship between AOQ and the true percent defective. 
E) The relationship between these two cannot be determined. 
A) AOQ is greater than the true percent defective. 
B) AOQ is the same as the true percent defective. 
C) AOQ is less than the true percent defective. 
D) There is no relationship between AOQ and the true percent defective. 
E) The relationship between these two cannot be determined.

Question 4

The causes of variation in statistical process control are:

Accepted Answer

A) cycles,trends,seasonality,and random variations. 
B) producer's causes and consumer's causes. 
C) mean and range. 
D) natural causes and assignable causes. 
E) Type I and Type II. 
A) cycles,trends,seasonality,and random variations. 
B) producer's causes and consumer's causes. 
C) mean and range. 
D) natural causes and assignable causes. 
E) Type I and Type II.

Question 5

A process is said to be in statistical control when assignable causes are the only sources of variation.

Accepted Answer

A) True 
 B)False

Question 6

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 7

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 8

The Central Limit Theorem states that when the sample size increases,the distribution of the sample means will approach the normal distribution.

Accepted Answer

A) True 
 B)False

Question 9

A hospital-billing auditor has been inspecting patient bills.While almost all bills contain some errors,the auditor is looking now for large errors (errors in excess of $250).Each day last week,the auditor examined 100 bills and found an average defect rate of 16%.Calculate the upper and lower limits for the billing process for 99.73% confidence.

Accepted Answer

0.16 plus or minus (

Question 10

A c-chart is appropriate to plot the number of flaws in a bolt of fabric.

Accepted Answer

A) True 
 B)False

Question 11

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 12

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

Accepted Answer

A) True 
 B)False

Question 13

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 14

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 15

The ________ is a quality control chart that indicates when changes occur in the central tendency of a production process.

Accepted Answer

The answer of The ________ is a quality control chart...

Question 16

Acceptance sampling:

Accepted Answer

A) is the application of statistical techniques to the control of processes. 
B) was developed by Walter Shewhart of Bell Laboratories. 
C) is used to determine whether to accept or reject a lot of material based on the evaluation of a sample. 
D) separates the natural and assignable causes of variation. 
E) is another name for 100% inspection. 
A) is the application of statistical techniques to the control of processes. 
B) was developed by Walter Shewhart of Bell Laboratories. 
C) is used to determine whether to accept or reject a lot of material based on the evaluation of a sample. 
D) separates the natural and assignable causes of variation. 
E) is another name for 100% inspection.

Question 17

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

Question 18

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& @#IMG-DLM& The process is ou

Question 19

Producer's risk is the probability of:

Accepted Answer

A) accepting a good lot. 
B) rejecting a good lot. 
C) rejecting a bad lot. 
D) accepting a bad lot. 
E) none of the above. 
A) accepting a good lot. 
B) rejecting a good lot. 
C) rejecting a bad lot. 
D) accepting a bad lot. 
E) none of the above.

Question 20

A process that is assumed to be in control with limits of 89 ± 2 had sample averages for the x-bar chart of the following: 87.1,87,87.2,89,90,88.5,89.5,and 88.Is the process in control?

Accepted Answer

A) Yes. 
B) No,one or more averages exceeded the limits. 
C) Not enough information to tell. 
D) No,there is a distinguishable trend. 
E) No,two or more consecutive points are very near the lower (or upper)limit. 
A) Yes. 
B) No,one or more averages exceeded the limits. 
C) Not enough information to tell. 
D) No,there is a distinguishable trend. 
E) No,two or more consecutive points are very near the lower (or upper)limit.

Exam 19: Statistical Process Control

The usual purpose of an R-chart is to signal whether there has been a:

Which of the following is true regarding the relationship between AOQ and the true population percent defective?

The causes of variation in statistical process control are:

A process is said to be in statistical control when assignable causes are the only sources of variation.

A Type I error occurs when:

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

The Central Limit Theorem states that when the sample size increases,the distribution of the sample means will approach the normal distribution.

A c-chart is appropriate to plot the number of flaws in a bolt of fabric.

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?

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

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

The ________ is a quality control chart that indicates when changes occur in the central tendency of a production process.

Acceptance sampling:

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?

Producer's risk is the probability of:

A process that is assumed to be in control with limits of 89 ± 2 had sample averages for the x-bar chart of the following: 87.1,87,87.2,89,90,88.5,89.5,and 88.Is the process in control?

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