Question 1

According to the text,what is the most common choice of limits for control charts?

Accepted Answer

A) ±1 standard deviation 
B) ±2 standard deviations 
C) ±3 standard deviations 
D) ±3 standard deviations for means and ± 2 standard deviations for ranges 
E) ±6 standard deviations 
A) ±1 standard deviation 
B) ±2 standard deviations 
C) ±3 standard deviations 
D) ±3 standard deviations for means and ± 2 standard deviations for ranges 
E) ±6 standard deviations

Question 2

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

Accepted Answer

Process capability refers to t

Question 3

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

Accepted Answer

A) True 
 B)False

Question 4

An operating characteristics curve shows:

Accepted Answer

A) upper and lower product specifications. 
B) product quality under different manufacturing conditions. 
C) how the probability of accepting a lot varies with the population percent defective. 
D) when product specifications don't match process control limits. 
E) how operations affect certain characteristics of a product. 
A) upper and lower product specifications. 
B) product quality under different manufacturing conditions. 
C) how the probability of accepting a lot varies with the population percent defective. 
D) when product specifications don't match process control limits. 
E) how operations affect certain characteristics of a product.

Question 5

To measure the voltage of batteries,one would sample by attributes.

Accepted Answer

A) True 
 B)False

Question 6

What is the AOQ of an acceptance sampling plan?

Accepted Answer

The AOQ is the average outgoin

Question 7

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 8

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 9

If μ = 9 ounces,σ = 0.5 ounces,and n = 9,calculate the 3-sigma control limits for the x-bar chart.

Accepted Answer

The answer of If μ = 9 ounces,σ = 0.5...

Question 10

A Cpk index of 1.00 equates to what defect rate?

Accepted Answer

A) five percent 
B) 3.4 defects per million items 
C) 2.7 defects per 1,000 items 
D) 97.23 percent 
E) one percent 
A) five percent 
B) 3.4 defects per million items 
C) 2.7 defects per 1,000 items 
D) 97.23 percent 
E) one percent

Question 11

The process capability measures Cp and Cpk differ because:

Accepted Answer

A) only one ensures the process mean is centered within the limits. 
B) Cp values above 1 indicate a capable process,while Cpk values above 2 indicate a capable process. 
C) They do not differ: both are identical. 
D) Cp values for a given process will always be greater than or equal to Cpk values. 
E) Both A and D are correct. 
A) only one ensures the process mean is centered within the limits. 
B) Cp values above 1 indicate a capable process,while Cpk values above 2 indicate a capable process. 
C) They do not differ: both are identical. 
D) Cp values for a given process will always be greater than or equal to Cpk values. 
E) Both A and D are correct.

Question 12

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.

Question 13

What is acceptance sampling?

Accepted Answer

Acceptance sampling is a metho

Question 14

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

Accepted Answer

A) A Cpk index value of 1 is the highest possible. 
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) Its value will always be at least as large as the Cp value for the same process. 
A) A Cpk index value of 1 is the highest possible. 
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) Its value will always be at least as large as the Cp value for the same process.

Question 15

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 16

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 17

What are the three possible results (or findings)from the use of control charts?

Accepted Answer

The results of a control chart

Question 18

The statistical definition of Six Sigma allows for 3.4 defects per million.This is achieved by what Cpk index value?

Accepted Answer

A) 6 
B) 1 
C) 1.33 
D) 1.67 
E) 2 
A) 6 
B) 1 
C) 1.33 
D) 1.67 
E) 2

Question 19

In acceptance sampling,a manager can reach the wrong conclusion if the sample is not representative of the population it was drawn from.

Accepted Answer

A) True 
 B)False

Question 20

In most acceptance sampling plans,when a lot is rejected,the entire lot is inspected and all defective items are replaced.When using this technique the AOQ:

Accepted Answer

A) worsens (AOQ becomes a larger fraction). 
B) improves (AOQ becomes a smaller fraction). 
C) is not affected,but the AQL is improved. 
D) is not affected. 
E) falls to zero. 
A) worsens (AOQ becomes a larger fraction). 
B) improves (AOQ becomes a smaller fraction). 
C) is not affected,but the AQL is improved. 
D) is not affected. 
E) falls to zero.

Exam 19: Statistical Process Control

According to the text,what is the most common choice of limits for control charts?

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

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

An operating characteristics curve shows:

To measure the voltage of batteries,one would sample by attributes.

What is the AOQ of an acceptance sampling plan?

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

If μ = 9 ounces,σ = 0.5 ounces,and n = 9,calculate the 3-sigma control limits for the x-bar chart.

A Cpk index of 1.00 equates to what defect rate?

The process capability measures Cp and Cpk differ because:

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?

What is acceptance sampling?

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

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

Assignable causes:

What are the three possible results (or findings)from the use of control charts?

The statistical definition of Six Sigma allows for 3.4 defects per million.This is achieved by what Cpk index value?

In acceptance sampling,a manager can reach the wrong conclusion if the sample is not representative of the population it was drawn from.

In most acceptance sampling plans,when a lot is rejected,the entire lot is inspected and all defective items are replaced.When using this technique the AOQ:

Operations and Productivity

Operations Strategy in a Global Environment

Project Management

Forecasting

Design of Goods and Services

Managing Quality

Process Strategy

Location Strategies

Layout Strategies

Human Resources,job Design,and Work Measurement

Supply Chain Management

Inventory Management

Aggregate Planning and Sop

Material Requirements Planning Mrpand ERP

Short-Term Scheduling

Lean Operations

Maintenance and Reliability

Sustainability in the Supply Chain

Capacity and Constraint Management

Supply Chain Management Analytics

Decision-Making Tools

Linear Programming

Transportation Models

Waiting-Line Models

Learning Curves

Simulation

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