Question 1

Mean charts and range charts complement one another,one detecting shifts in process average,the other detecting shifts in process dispersion.

Accepted Answer

A) True 
 B)False  True

Question 2

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. E

Question 3

A Cp value of 1.33 indicates a standard of how many standard deviations (sigmas)?

Accepted Answer

A) 6 
B) 1.33 
C) 2 
D) 3 
E) 4 
A) 6 
B) 1.33 
C) 2 
D) 3 
E) 4 E

Question 4

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 5

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 + 1

Question 6

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 7

________ 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 8

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 9

The specification for a plastic liner for concrete highway projects calls for a thickness of 6.0 mm ± 0.1 mm.The standard deviation of the process is estimated to be 0.02 mm.What are the upper and lower specification limits for this product? The process is known to operate at a mean thickness of 6.03 mm.What is the Cp and Cpk for this process? About what percent of all units of this liner will meet specifications?

Accepted Answer

LSL = 5.9 mm,USL = 6.1 mm.Cp is (6.1 - 5

Question 10

What do the terms producer's risk and consumer's risk mean?

Accepted Answer

Producer's risk: the risk of r

Question 11

An x-bar control chart was examined and no data points fell outside of the limits.Can this process be considered in control?

Accepted Answer

A) Not yet,there could be a pattern to the points. 
B) Not yet,the R-chart must be checked. 
C) Not yet,the number of samples must be known. 
D) Yes. 
E) Both A and B 
A) Not yet,there could be a pattern to the points. 
B) Not yet,the R-chart must be checked. 
C) Not yet,the number of samples must be known. 
D) Yes. 
E) Both A and B

Question 12

The purpose of process control is to detect when natural causes of variation are present.

Accepted Answer

A) True 
 B)False

Question 13

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 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 Cp and Cpk for the process.Give the consultant advice on what to do with the process based on your findings.

Accepted Answer

Cp = (21 - 19)/(6*.7)= .476
Cp

Question 15

A lot that is accepted by acceptance sampling is certified to be free of defects.

Accepted Answer

A) True 
 B)False

Question 16

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

Accepted Answer

Assignable

Question 17

A bank's manager has videotaped 20 different teller transactions to observe the number of mistakes being made.Ten transactions had no mistakes,five had one mistake and five had two mistakes.Compute proper control limits at the 90% confidence level.

Accepted Answer

A c-chart should be used,and f

Question 18

An acceptance sampling plan is to be designed to meet the organization's targets for product quality and risk levels.Which of the following is true?

Accepted Answer

A) n and c determine the AQL. 
B) AQL,LTPD,α and β collectively determine n and c. 
C) n and c are determined from the values of AQL and LTPD. 
D) α and β are determined from the values of AQL and LTPD. 
E) None of the above is true. 
A) n and c determine the AQL. 
B) AQL,LTPD,α and β collectively determine n and c. 
C) n and c are determined from the values of AQL and LTPD. 
D) α and β are determined from the values of AQL and LTPD. 
E) None of the above is true.

Question 19

Which of the following statements about acceptance sampling is TRUE?

Accepted Answer

A) The steeper an OC curve,the better it discriminates between good and bad lots. 
B) Acceptance sampling removes all defective items. 
C) Acceptance sampling of incoming lots is replacing statistical process control at the supplier. 
D) Acceptance sampling occurs continuously along the assembly line. 
E) All of the above are true. 
A) The steeper an OC curve,the better it discriminates between good and bad lots. 
B) Acceptance sampling removes all defective items. 
C) Acceptance sampling of incoming lots is replacing statistical process control at the supplier. 
D) Acceptance sampling occurs continuously along the assembly line. 
E) All of the above are true.

Question 20

For a 3-sigma x-bar chart where the process standard deviation is known,the upper control limit:

Accepted Answer

A) is 3σ below the mean of sample means for a 3σ control chart. 
B) is 3σ above the mean of sample means for a 3σ control chart. 
C) is 3σ/   below the mean of sample means for a 3σ control chart. 
D) is 3σ/   above the mean of sample means for a 3σ control chart. 
E) cannot be calculated unless the average range is known. 
A) is 3σ below the mean of sample means for a 3σ control chart. 
B) is 3σ above the mean of sample means for a 3σ control chart. 
C) is 3σ/   below the mean of sample means for a 3σ control chart. 
D) is 3σ/   above the mean of sample means for a 3σ control chart. 
E) cannot be calculated unless the average range is known.

Exam 19: Statistical Process Control

Mean charts and range charts complement one another,one detecting shifts in process average,the other detecting shifts in process dispersion.

Acceptance sampling:

A Cp value of 1.33 indicates a standard of how many standard deviations (sigmas)?

A Cpk index of 1.00 equates to what defect rate?

An operating characteristics curve shows:

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

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

What do the terms producer's risk and consumer's risk mean?

An x-bar control chart was examined and no data points fell outside of the limits.Can this process be considered in control?

The purpose of process control is to detect when natural causes of variation are present.

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

A lot that is accepted by acceptance sampling is certified to be free of defects.

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

A bank's manager has videotaped 20 different teller transactions to observe the number of mistakes being made.Ten transactions had no mistakes,five had one mistake and five had two mistakes.Compute proper control limits at the 90% confidence level.

An acceptance sampling plan is to be designed to meet the organization's targets for product quality and risk levels.Which of the following is true?

Which of the following statements about acceptance sampling is TRUE?

For a 3-sigma x-bar chart where the process standard deviation is known,the upper control limit:

Operations and Productivity

The Global Environment and Operations Strategy

Managing Projects

Forecasting Demand

Product Design

Quality Management and International Standards

Process Design

Location Decisions

Layout Decisions

Job Design and Work Measurement

Supply Chain Management

Managing Inventory

Aggregate Scheduling

Material Requirements Planning Mrpand Erp

Scheduling for the Short-Term

Jit,lean Operations,and the Toyota Production System

Maintenance and Reliability Decisions

Sustainability

Capacity Planning

Supply Chain Modeling

Decision Modeling

Linear Programming Models

Transportation Modeling

Queuing Models

Learning Curves

Modeling with Simulation

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