Question 1

Statistical process control charts:

Accepted Answer

A) display the measurements on every item being produced. 
B) display upper and lower limits for process variables or attributes and signal when a process is no longer in control. 
C) indicate to the process operator the average outgoing quality of each lot. 
D) indicate to the operator the true quality of material leaving the process. 
E) are a graphic way of classifying problems by their level of importance,often referred to as the 80-20 rule. 
A) display the measurements on every item being produced. 
B) display upper and lower limits for process variables or attributes and signal when a process is no longer in control. 
C) indicate to the process operator the average outgoing quality of each lot. 
D) indicate to the operator the true quality of material leaving the process. 
E) are a graphic way of classifying problems by their level of importance,often referred to as the 80-20 rule.

Question 2

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 3

The x-bar chart,like the c-chart,is based on the exponential distribution.

Accepted Answer

A) True 
 B)False

Question 4

A manufacturer uses statistical process control to control the quality of the firm's products.Samples of 50 of Product A are taken,and a defective/acceptable decision is made on each unit sampled.For Product B,the number of flaws per unit is counted.What type(s)of control charts should be used?

Accepted Answer

A) p-charts for both A and B 
B) p-chart for A,c-chart for B 
C) c-charts for both A and B 
D) p-chart for A,mean and range charts for B 
E) c-chart for A,mean and range charts for B 
A) p-charts for both A and B 
B) p-chart for A,c-chart for B 
C) c-charts for both A and B 
D) p-chart for A,mean and range charts for B 
E) c-chart for A,mean and range charts for B

Question 5

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

Accepted Answer

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

Question 6

If a process has only natural variations,________ percent of the time the sample averages will fall inside the ±3-sigma control limits.

Accepted Answer

The answer of If a process has only natural variations,________...

Question 7

A process that is in statistical control will always yield products that meet their design specifications.

Accepted Answer

A) True 
 B)False

Question 8

What is the statistical process chart used to control the number of defects per unit of output?

Accepted Answer

A) x-bar chart 
B) R-chart 
C) p-chart 
D) AOQ chart 
E) c-chart 
A) x-bar chart 
B) R-chart 
C) p-chart 
D) AOQ chart 
E) c-chart

Question 9

The Central Limit Theorem:

Accepted Answer

A) is the theoretical foundation of the c-chart. 
B) states that the average of assignable variations is zero. 
C) allows managers to use the normal distribution as the basis for building some control charts. 
D) states that the average range can be used as a proxy for the standard deviation. 
E) controls the steepness of an operating characteristic curve. 
A) is the theoretical foundation of the c-chart. 
B) states that the average of assignable variations is zero. 
C) allows managers to use the normal distribution as the basis for building some control charts. 
D) states that the average range can be used as a proxy for the standard deviation. 
E) controls the steepness of an operating characteristic curve.

Question 10

The local newspaper receives several complaints per day about typographic errors.Over a seven-day period,the publisher has received calls from readers reporting the following total daily number of errors: 4,3,2,6,7,3,and 9.Based on these data alone,what type of control chart(s)should the publisher use?

Accepted Answer

A) p-chart 
B) c-chart 
C) x-bar chart 
D) R-chart 
E) x-bar chart and R-chart 
A) p-chart 
B) c-chart 
C) x-bar chart 
D) R-chart 
E) x-bar chart and R-chart

Question 11

Under which of the following situations will the average outgoing quality (AOQ)decrease?

Accepted Answer

A) The true percentage defective of the lot increases. 
B) The number of items in the sample decreases. 
C) The number of items in the lot decreases. 
D) The probability of accepting the lot for a given sample size and quantity defective increases. 
E) The difference between the number of items in the lot and the number of items in the sample increases. 
A) The true percentage defective of the lot increases. 
B) The number of items in the sample decreases. 
C) The number of items in the lot decreases. 
D) The probability of accepting the lot for a given sample size and quantity defective increases. 
E) The difference between the number of items in the lot and the number of items in the sample increases.

Question 12

An acceptance sampling plan must define "good lots" and "bad lots" and specify the risk level associated with each one.

Accepted Answer

A) True 
 B)False

Question 13

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.In relatively plain English (someone else will translate for Pierre),explain exactly what he will do when performing the acceptance sampling procedure,and what actions he might take based on the results.

Accepted Answer

Pierre should select samples of size 175

Question 14

A Cpk index greater than ________ is a capable process,one that generates fewer than 2.7 defects per 1000 at the ±3σ level.

Accepted Answer

The answer of A Cpk index greater than ________ is...

Question 15

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 16

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 17

What does it mean for a process to be "capable"?

Accepted Answer

Process capability refers to t

Question 18

Natural variations:

Accepted Answer

A) are variations that are to be identified and investigated. 
B) are variations that can be traced to a specific cause. 
C) are the same as assignable variations. 
D) lead to occasional false findings that processes are out of control. 
E) play no role in statistical process control. 
A) are variations that are to be identified and investigated. 
B) are variations that can be traced to a specific cause. 
C) are the same as assignable variations. 
D) lead to occasional false findings that processes are out of control. 
E) play no role in statistical process control.

Question 19

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 20

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

Accepted Answer

A) True 
 B)False

Exam 19: Statistical Process Control

Statistical process control charts:

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

The x-bar chart,like the c-chart,is based on the exponential distribution.

A manufacturer uses statistical process control to control the quality of the firm's products.Samples of 50 of Product A are taken,and a defective/acceptable decision is made on each unit sampled.For Product B,the number of flaws per unit is counted.What type(s)of control charts should be used?

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

If a process has only natural variations,________ percent of the time the sample averages will fall inside the ±3-sigma control limits.

A process that is in statistical control will always yield products that meet their design specifications.

What is the statistical process chart used to control the number of defects per unit of output?

The Central Limit Theorem:

Under which of the following situations will the average outgoing quality (AOQ)decrease?

An acceptance sampling plan must define "good lots" and "bad lots" and specify the risk level associated with each one.

A Cpk index greater than ________ is a capable process,one that generates fewer than 2.7 defects per 1000 at the ±3σ level.

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

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

What does it mean for a process to be "capable"?

Natural variations:

Acceptance sampling is usually used to control:

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

Operations and Productivity

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Forecasting Demand

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Quality Management and International Standards

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Job Design and Work Measurement

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