Question 1

Averages of small samples,not individual measurements,are generally used in statistical process control.

Accepted Answer

A) True 
 B)False

Question 2

Acceptance sampling accepts or rejects an entire lot based on the information contained in the sample.

Accepted Answer

A) True 
 B)False

Question 3

The normal application of a p-chart is in

Accepted Answer

A) process sampling by variables. 
B) acceptance sampling by variables. 
C) process sampling by attributes. 
D) acceptance sampling by attributes. 
E) rejection sampling by attributes. 
A) process sampling by variables. 
B) acceptance sampling by variables. 
C) process sampling by attributes. 
D) acceptance sampling by attributes. 
E) rejection sampling by attributes.

Question 4

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   and   for this process? Is this process capable of producing the desired part?

Accepted Answer

LSL = 5.8 inches,USL = 6.2 inches. @#IMG-DLM& is (

Question 5

The c-chart signals whether there has been a

Accepted Answer

A) gain or loss in uniformity. 
B) change in the number of defects per unit. 
C) change in the central tendency of the process output. 
D) change in the percent defective in a sample. 
E) change in the AOQ. 
A) gain or loss in uniformity. 
B) change in the number of defects per unit. 
C) change in the central tendency of the process output. 
D) change in the percent defective in a sample. 
E) change in the AOQ.

Question 6

The specifications for a manifold gasket that installs between two engine parts calls for a thickness of 2.500 mm ± .020 mm.The standard deviation of the process is estimated to be 0.004 mm.What are the upper and lower specification limits for this product? The process is currently operating at a mean thickness of 2.50 mm.(a)What is the Cp for this process? (b)About what percent of all units of this liner will meet specifications? Does this meet the technical definition of Six Sigma?

Accepted Answer

(a)LSL = 2.48 mm. ,USL = 2.52 mm. @#IMG-DLM& = (2.

Question 7

A process is operating in such a manner that the mean of the process is exactly on the lower specification limit.What must be true about the two measures of capability for this process?

Accepted Answer

The Cp ratio does not consider how well

Question 8

A car mechanic is thinking of guaranteeing customers that an oil change will take no more than 15 minutes with a 99.73% confidence level.He takes a few samples of size 5 and finds the process mean to be 13 minutes with a standard deviation of .2 minutes and average sample range of 1.2 minutes.Find the   ,   ,and   values and use them to compute the upper and lower limits for an x-bar chart.Use the upper limit to determine if the mechanic can offer a 15 minute guarantee.Assume the mechanic plots the samples on the x-bar control chart and finds the process is in control,is there anything else the mechanic is missing to ensure the process is in control?

Accepted Answer

From Table S6.1 @#IMG-DLM& = .577 @#IMG-DLM& = 2.115 @#IMG-DLM& = 0
UC

Question 9

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

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) ± 1 standard deviations for means and ± 2 standard deviations for ranges. 
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) ± 1 standard deviations for means and ± 2 standard deviations for ranges.

Question 10

McDaniel Shipyards wants to develop control charts to assess the quality of its steel plate.They take ten sheets of 1" steel plate and compute the number of cosmetic flaws on each roll.Each sheet is 20' by 100'.Based on the following data,develop limits for the control chart,plot the control chart,and determine whether the process is in control.

Accepted Answer

@#IMG-DLM& @#IMG-DLM& Sample six is abov

Question 11

________ is variation in a production process that can be traced to specific causes.

Accepted Answer

Assignable

Question 12

A city police chief decides to do an annual review of the police department by checking the number of monthly complaints.If the total number of complaints in each of the 12 months were 15,18,13,12,16,20,5,10,9,11,8,and 3 and the police chief wants a 90% confidence level,are the complaints in control?

Accepted Answer

From Table S6.2 z=1.65
c-bar = (15 + 18

Question 13

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 14

A consultant has been brought in to a manufacturing plant to help apply six sigma principles.Her first task is to work on the production of rubber balls.The upper and lower spec limits are 21 and 19 cm respectively.The consultant takes ten samples of size five and computes the sample standard deviation to be .7 cm and the sample mean to be 19.89 cm.Compute   and   for the process.Give the consultant advice on what to do with the process based on your findings.

Accepted Answer

@#IMG-DLM& = (21 - 19)/(6∗.7)= .476 @#IMG-DLM& = min ( (21 -

Question 15

What is the difference between natural and assignable causes of variation?

Accepted Answer

Natural variations are those variations

Question 16

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

Accepted Answer

A) True 
 B)False

Question 17

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 18

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

Accepted Answer

A) True 
 B)False

Question 19

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 20

Average outgoing quality (AOQ)usually

Accepted Answer

A) worsens with inspection. 
B) stays the same with inspection. 
C) improves with inspection. 
D) may either improve or worsen with inspection. 
E) is the average quality before inspection. 
A) worsens with inspection. 
B) stays the same with inspection. 
C) improves with inspection. 
D) may either improve or worsen with inspection. 
E) is the average quality before inspection.

Averages of small samples,not individual measurements,are generally used in statistical process control.

Acceptance sampling accepts or rejects an entire lot based on the information contained in the sample.

The normal application of a p-chart is in

The c-chart signals whether there has been a

A process is operating in such a manner that the mean of the process is exactly on the lower specification limit.What must be true about the two measures of capability for this process?

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

________ is variation in a production process that can be traced to specific causes.

Assignable causes

What is the difference between natural and assignable causes of variation?

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

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

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

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

Average outgoing quality (AOQ)usually

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Exam 18: Statistical Process Control

Averages of small samples,not individual measurements,are generally used in statistical process control.

Acceptance sampling accepts or rejects an entire lot based on the information contained in the sample.

The normal application of a p-chart is in

The c-chart signals whether there has been a

A process is operating in such a manner that the mean of the process is exactly on the lower specification limit.What must be true about the two measures of capability for this process?

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

________ is variation in a production process that can be traced to specific causes.

Assignable causes

What is the difference between natural and assignable causes of variation?

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

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

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

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

Average outgoing quality (AOQ)usually

Operations and Productivity

Operations Strategy in a Global Environment

Project Management

Forecasting

Design of Goods and Services

Managing Quality

Process Strategy and Sustainability

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 Mrpand Erp

Short-Term Scheduling

Jit and Lean Operations

Maintenance and Reliability

Decision-Making Tools

Linear Programming

Transportation Models

Waiting-Line Models

Learning Curves

Simulation

Filters