Question 1

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

Accepted Answer

A)  $\bar { X }$ -chart 
B)  R-chart 
C)  p-chart 
D)  AOQ chart 
E)  c-chart 
A)  $\bar { X }$ -chart 
B)  R-chart 
C)  p-chart 
D)  AOQ chart 
E)  c-chart

Question 2

If a sample of items is taken and the mean of the sample is outside the control limits the process is

Accepted Answer

A)  out of control and the cause should be established 
B)  in control, but not capable of producing within the established control limits 
C)  within the established control limits with only natural causes of variation 
D)  monitored closely to see if the next sample mean will also fall outside the control limits 
E)  producing high quality products 
A)  out of control and the cause should be established 
B)  in control, but not capable of producing within the established control limits 
C)  within the established control limits with only natural causes of variation 
D)  monitored closely to see if the next sample mean will also fall outside the control limits 
E)  producing high quality products

Question 3

__________ is a method of measuring samples of lots or batches of product against predetermined standards.

Accepted Answer

The answer of __________ is a method of measuring samples...

Question 4

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 5

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 6

In statistical process control, the range often substitutes for the standard deviation.

Accepted Answer

A) True 
 B)False

Question 7

Why do range charts exist?
 Aren't x-bar charts enough?

Accepted Answer

Range charts and mean charts perform dif

Question 8

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 9

What is the AOQ of an acceptance sampling plan?

Accepted Answer

The AOQ is the average outgoin

Question 10

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

Accepted Answer

The answer of If μ = 9 ounces, σ =...

Question 11

Why doesn't acceptance sampling remove all defects from a batch?

Accepted Answer

Acceptance sampling is a method of measu

Question 12

Up to three standard deviations above or below the centerline is the amount of variation that statistical process control allows for

Accepted Answer

A)  Type I errors 
B)  about 95.5% variation 
C)  natural variation 
D)  all types of variation 
E)  assignable variation 
A)  Type I errors 
B)  about 95.5% variation 
C)  natural variation 
D)  all types of variation 
E)  assignable variation

Question 13

What four elements determine the value of average outgoing quality?
 Why does this curve rise, peak, and fall?

Accepted Answer

The four elements are the True percent d

Question 14

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 15

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 16

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

Accepted Answer

A) True 
 B)False

Question 17

The mean and standard deviations for a process are μ= 90 and σ = 9. For the variable control chart, a sample size of 16 will be used. Calculate the standard deviation of the sampling distribution.

Accepted Answer

Sigma x-ba

Question 18

In the table below are selected values for the OC curve associated with the acceptance sampling plan n=50, c=1. (Watch out--the points are not evenly spaced.) Assume that upon failed inspection, defective items are replaced. Calculate the AOQ for each data point. (You may assume that the population is much larger than the sample.) Plot the AOQ curve. At approximately what population defective rate is the AOQ at its worst?
 Explain how this happens. How well does this plan meet the specifications of AQL=0.0050, α =0.05; LTPD=0.05, β =0.10?
 Discuss.
 $$\begin{array} { | c | c | } 
\hline \begin{array} { c } 
\text { Population percent } \
\text { defective }
\end{array} & \begin{array} { c } 
\text { Probability of } \
\text { acceptance }
\end{array} \
\hline 0.005 & 0.97387 \
\hline 0.01 & 0.91056 \
\hline 0.02 & 0.73577 \
\hline 0.03 & 0.55528 \
\hline 0.04 & 0.40048 \
\hline 0.05 & 0.27943 \
\hline 0.06 & 0.19000 \
\hline 0.08 & 0.08271 \
\hline
\end{array}$$

Accepted Answer

This plan does not meet the sp

Question 19

An operating characteristic (OC) curve describes

Accepted Answer

A)  how many defects per unit are permitted before rejection occurs 
B)  the sample size necessary to distinguish between good and bad lots 
C)  the most appropriate sampling plan for a given incoming product quality level 
D)  how well an acceptance sampling plan discriminates between good and bad lots 
E)  none of the above 
A)  how many defects per unit are permitted before rejection occurs 
B)  the sample size necessary to distinguish between good and bad lots 
C)  the most appropriate sampling plan for a given incoming product quality level 
D)  how well an acceptance sampling plan discriminates between good and bad lots 
E)  none of the above

Question 20

The specification for a plastic handle calls for a length of 6.0 inches ± .2 inches. The standard deviation of the process is estimated to be 0.05 inches. What are the upper and lower specification limits for this product?
 The process is known to operate at a mean thickness of 6.1 inches. What is the Cp and Cpk for this process?
 Is this process capable of producing the desired part?

Accepted Answer

LSL = 5.8 inches, USL = 6.2 inches. Cp i

Exam 7: Statistical Process Control

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

If a sample of items is taken and the mean of the sample is outside the control limits the process is

__________ is a method of measuring samples of lots or batches of product against predetermined standards.

A Type I error occurs when

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

In statistical process control, the range often substitutes for the standard deviation.

Why do range charts exist? Aren't x-bar charts enough?

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

What is the AOQ of an acceptance sampling plan?

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

Why doesn't acceptance sampling remove all defects from a batch?

Up to three standard deviations above or below the centerline is the amount of variation that statistical process control allows for

What four elements determine the value of average outgoing quality? Why does this curve rise, peak, and fall?

Control charts for variables are based on data that come from

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

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

The mean and standard deviations for a process are μ= 90 and σ = 9. For the variable control chart, a sample size of 16 will be used. Calculate the standard deviation of the sampling distribution.

An operating characteristic (OC) curve describes

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