Question 1

A normal distribution is generally described by its two parameters: the mean and the range.

Accepted Answer

A) True 
 B)False

Question 2

The number of defects after a hotel room cleaning (sheets not straight, smears on mirror, missed debris on carpet, etc) should be measured using a(n)

Accepted Answer

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

Question 3

An acceptance sampling plan's ability to discriminate between low quality lots and high quality lots is described by

Accepted Answer

A)  a Gantt chart 
B)  the Central Limit Theorem 
C)  a process control chart 
D)  an operating characteristics curve 
E)  a range chart 
A)  a Gantt chart 
B)  the Central Limit Theorem 
C)  a process control chart 
D)  an operating characteristics curve 
E)  a range chart

Question 4

Acceptance sampling

Accepted Answer

A)  may involve inspectors taking random samples (or batches) of finished products and measuring them against predetermined standards 
B)  may involve inspectors taking random samples (or batches) of incoming raw materials and measuring them against predetermined standards 
C)  is more economical than 100% inspection 
D)  may be either of a variable or attribute type, although attribute inspection is more common in the business environment 
E)  All of the above are true. 
A)  may involve inspectors taking random samples (or batches) of finished products and measuring them against predetermined standards 
B)  may involve inspectors taking random samples (or batches) of incoming raw materials and measuring them against predetermined standards 
C)  is more economical than 100% inspection 
D)  may be either of a variable or attribute type, although attribute inspection is more common in the business environment 
E)  All of the above are true.

Question 5

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 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 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 6

If the Cpk index exceeds 1

Accepted Answer

A)  the AQL must be smaller than the LTPD 
B)  σ must be less than one-third of the absolute value of the difference between each specification and the process mean 
C)  the x-bar chart must indicate that the process is in control 
D)  the process is capable of Six Sigma quality 
E)  the process is characterized as "not capable" 
A)  the AQL must be smaller than the LTPD 
B)  σ must be less than one-third of the absolute value of the difference between each specification and the process mean 
C)  the x-bar chart must indicate that the process is in control 
D)  the process is capable of Six Sigma quality 
E)  the process is characterized as "not capable"

Question 7

A woodworker is concerned about the quality of the finished appearance of her work. In sampling units of a split-willow hand-woven basket, she has found the following number of finish defects in ten units sampled: 4, 0, 3, 1, 2, 0, 1, 2, 0, 2.
a. Calculate the average number of defects per basket
b. If 3-sigma control limits are used, calculate the lower control limit, centerline, and upper control limit.

Accepted Answer

(a) 1.5; (

Question 8

The acceptable quality level (AQL) is the average level of quality we are willing to accept.

Accepted Answer

A) True 
 B)False

Question 9

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. The UCL and LCL for this range chart are

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 10

What is the purpose of the Operating Characteristics curve?

Accepted Answer

An OC curve plots the probabil

Question 11

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 12

A retail store manager is trying to improve and control the rate at which cashiers sign customers up
for store credit cards. Suppose the manager takes 10 samples, each with 100 observations. P-bar
is found to be .05, and the manager does not want a lower limit below .0064. What z-value would
this imply, and how confident can he be that the true lower limit is greater than or equal to .0064?

Accepted Answer

Sigma-p = sqrt ( .05*(1-.05)/100) = .021

Question 13

A process that is assumed to be in control with limits of 89 +/- 2 had sample averages of the following 87.1, 87, 87.2, 89, 90, 89.5, 88.5, 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 14

Why are x-bar and R-charts usually used hand in hand?

Accepted Answer

The ultimate goal of the x-bar
 and R-ch

A normal distribution is generally described by its two parameters: the mean and the range.

The number of defects after a hotel room cleaning (sheets not straight, smears on mirror, missed debris on carpet, etc) should be measured using a(n)

An acceptance sampling plan's ability to discriminate between low quality lots and high quality lots is described by

Acceptance sampling

If the Cpk index exceeds 1

The acceptable quality level (AQL) is the average level of quality we are willing to accept.

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. The UCL and LCL for this range chart are

What is the purpose of the Operating Characteristics curve?

Natural variations

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

Why are x-bar and R-charts usually used hand in hand?

Operations and Productivity

Operations Strategy in a Global Environment

Project Management

Forecasting

Design of Goods and Services

Managing Quality

Process Strategy

Capacity and Constraint Management

Location Strategies

Layout Strategies

Human Resources, Job Design, and Work Measurement

Supply-Chain Management

Outsourcing as a Supply-Chain Strategy

Inventory Management

Aggregate Planning

Material Requirements Planning MRP and ERP

Short-Term Scheduling

Just-In-Time and Lean Options

Maintenance and Reliability

Decision-Making Tools

Linear Programming

Transportation Models

Waiting-Line Models

Learning Curves

Simulation

Filters

Exam 7: Statistical Process Control

A normal distribution is generally described by its two parameters: the mean and the range.

The number of defects after a hotel room cleaning (sheets not straight, smears on mirror, missed debris on carpet, etc) should be measured using a(n)

An acceptance sampling plan's ability to discriminate between low quality lots and high quality lots is described by

Acceptance sampling

If the Cpk index exceeds 1

The acceptable quality level (AQL) is the average level of quality we are willing to accept.

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. The UCL and LCL for this range chart are

What is the purpose of the Operating Characteristics curve?

Natural variations

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

Why are x-bar and R-charts usually used hand in hand?

Operations and Productivity

Operations Strategy in a Global Environment

Project Management

Forecasting

Design of Goods and Services

Managing Quality

Process Strategy

Capacity and Constraint Management

Location Strategies

Layout Strategies

Human Resources, Job Design, and Work Measurement

Supply-Chain Management

Outsourcing as a Supply-Chain Strategy

Inventory Management

Aggregate Planning

Material Requirements Planning MRP and ERP

Short-Term Scheduling

Just-In-Time and Lean Options

Maintenance and Reliability

Decision-Making Tools

Linear Programming

Transportation Models

Waiting-Line Models

Learning Curves

Simulation

Filters