Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

The purpose of an x-bar chart is to determine whether there has been a

Accepted Answer

A)  change in the dispersion of the process output 
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 AOQ 
A)  change in the dispersion of the process output 
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 AOQ

Question 3

Which of the following was Unisys Corp.'s failed quality measure in its management of Florida Health Care Services?

Accepted Answer

A)  percentage of claims processed with errors 
B)  percentage of claims processed within 30 days 
C)  number of claims processed per month 
D)  number of claims denied 
E)  both A and B 
A)  percentage of claims processed with errors 
B)  percentage of claims processed within 30 days 
C)  number of claims processed per month 
D)  number of claims denied 
E)  both A and B

Question 4

Which of the following is true regarding the process capability index Cpk?

Accepted Answer

A)  A Cpk index value of 1 is ideal, meaning all units meet specifications. 
B)  The larger the Cpk, the more units meet specifications. 
C)  The Cpk index can only be used when the process centerline is also the specification centerline. 
D)  Positive values of the Cpk index are good; negative values are bad. 
E)  None of the above is true. 
A)  A Cpk index value of 1 is ideal, meaning all units meet specifications. 
B)  The larger the Cpk, the more units meet specifications. 
C)  The Cpk index can only be used when the process centerline is also the specification centerline. 
D)  Positive values of the Cpk index are good; negative values are bad. 
E)  None of the above is true.

Question 5

Ten samples of size four were taken from a process, and their weights measured. The sample averages and sample ranges are in the following table. Construct and plot an x-bar and R-chart using this data. Is the process in control?
 $$\begin{array} { | l | r | r | } 
\hline \text { Sample } & \text { Mean } & \text { Range } \
\hline 1 & 20.01 & 0.45 \
\hline 2 & 19.98 & 0.67 \
\hline 3 & 20.25 & 0.30 \
\hline 4 & 19.90 & 0.30 \
\hline 5 & 20.35 & 0.36 \
\hline 6 & 19.23 & 0.49 \
\hline 7 & 20.01 & 0.53 \
\hline 8 & 19.98 & 0.40 \
\hline 9 & 20.56 & 0.95 \
\hline 10 & 19.97 & 0.79 \
\hline
\end{array}$$

Accepted Answer

@#IMG-DLM& 
 @#IMG-DLM& The x-bar chart is out of

Question 6

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 7

Assignable causes

Accepted Answer

A)  are not as important as natural causes 
B)  are within the limits of a control chart 
C)  depend on the inspector assigned to the job 
D)  are also referred to as "chance" causes 
E)  are causes of variation that can be identified and investigated 
A)  are not as important as natural causes 
B)  are within the limits of a control chart 
C)  depend on the inspector assigned to the job 
D)  are also referred to as "chance" causes 
E)  are causes of variation that can be identified and investigated

Question 8

An x-bar control chart was examined and no data points fell outside of the limits. Can this process be considered in control?

Accepted Answer

A)  No, there could be a pattern to the points. 
B)  No, the R-chart must be checked. 
C)  No, the number of samples must be known. 
D)  Yes 
E)  Both A and B 
A)  No, there could be a pattern to the points. 
B)  No, the R-chart must be checked. 
C)  No, the number of samples must be known. 
D)  Yes 
E)  Both A and B

Question 9

The upper and lower limits for diving ring diameters made by John's Swimming are 40 and 39 cm. John took 11 samples with the following average diameters (39, 39.1, 39.2, 39.3, 39.4, 39.5 39.6, 39.7, 39.8, 39.9, 40). Is the process in control?

Accepted Answer

A)  Yes, no diameters exceeded the control limits. 
B)  No, some diameters exceeded the control limits. 
C)  No, there is a distinguishable pattern to the samples. 
D)  No, the range is not in control. 
E)  There is not enough information to make a decision. 
A)  Yes, no diameters exceeded the control limits. 
B)  No, some diameters exceeded the control limits. 
C)  No, there is a distinguishable pattern to the samples. 
D)  No, the range is not in control. 
E)  There is not enough information to make a decision.

Question 10

Jars of pickles are sampled and weighed. Sample measures are plotted on control charts. The ideal weight should be precisely 11 oz. Which type of chart(s) would you recommend?

Accepted Answer

A)  p-charts 
B)  c-charts 
C)  $\overline { \mathrm { X } }$ - and R-charts 
D)  $\overline { \mathrm { X } }$ -, but not R-charts 
E)  both p- and c-charts 
A)  p-charts 
B)  c-charts 
C)  $\overline { \mathrm { X } }$ - and R-charts 
D)  $\overline { \mathrm { X } }$ -, but not R-charts 
E)  both p- and c-charts

Question 11

A retail store manager is trying to improve and control the rate at which cashiers sign customers up for store credit cards. Suppose that the manager wants the maximum standard deviation of the sampling distribution to be 5% and he cannot estimate p-bar. How many observations per sample would this require?

Accepted Answer

Maximum standard deviation occ

Question 12

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 t

Question 13

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 14

Can "in control" and "capable" be shown on the same chart?

Accepted Answer

Only indirectly. The chart illustrating

Question 15

What is acceptance sampling?

Accepted Answer

Acceptance sampling is a metho

Question 16

Red Top Cab Company receives multiple complaints per day about driver behavior. Over 9 days the owner recorded the number of calls to be 3, 0, 8, 9, 6, 7, 4, 9, 8. What is the upper control limit for the c-chart?

Accepted Answer

A)  13.35 
B)  8.45 
C)  24.00 
D)  0.00 
E)  9.03 
A)  13.35 
B)  8.45 
C)  24.00 
D)  0.00 
E)  9.03

Question 17

What is the basic objective of a process control system?

Accepted Answer

It is to provide a s

Question 18

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 19

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

Accepted Answer

The CLT underlies the distribu

Question 20

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.

Exam 7: Statistical Process Control

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

The purpose of an x-bar chart is to determine whether there has been a

Which of the following was Unisys Corp.'s failed quality measure in its management of Florida Health Care Services?

Which of the following is true regarding the process capability index Cpk?

Natural variations

Assignable causes

An x-bar control chart was examined and no data points fell outside of the limits. Can this process be considered in control?

The upper and lower limits for diving ring diameters made by John's Swimming are 40 and 39 cm. John took 11 samples with the following average diameters (39, 39.1, 39.2, 39.3, 39.4, 39.5 39.6, 39.7, 39.8, 39.9, 40). Is the process in control?

Jars of pickles are sampled and weighed. Sample measures are plotted on control charts. The ideal weight should be precisely 11 oz. Which type of chart(s) would you recommend?

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

Can "in control" and "capable" be shown on the same chart?

What is acceptance sampling?

Red Top Cab Company receives multiple complaints per day about driver behavior. Over 9 days the owner recorded the number of calls to be 3, 0, 8, 9, 6, 7, 4, 9, 8. What is the upper control limit for the c-chart?

What is the basic objective of a process control system?

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

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

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