Question 1

What is acceptance sampling?

Accepted Answer

Acceptance sampling is a metho

Question 2

A process range chart illustrates the amount of dispersion within the samples.

Accepted Answer

A) True 
 B)False

Question 3

A manager wants to build 3-sigma x-bar control limits for a process.The target value for the mean of the process is 10 units,and the standard deviation of the process is 6.If samples of size 9 are to be taken,what will be the upper and lower control limits,respectively?

Accepted Answer

A) -8 and 28 
B) 16 and 4 
C) 12 and 8 
D) 4 and 16 
E) 8 and 12 
A) -8 and 28 
B) 16 and 4 
C) 12 and 8 
D) 4 and 16 
E) 8 and 12

Question 4

An operator trainee is attempting to monitor a filling process that has an overall average of 705 cc.The average range is 17 cc.If you use a sample size of 6,what are the upper and lower control limits for the x-bar chart and R-chart?

Accepted Answer

From the table,A2 = 0.483,D4 =

Question 5

Pierre's Motorized Pirogues and Mudboats is setting up an acceptance sampling plan for the special air cleaners he manufactures for his boats.His specifications,and the resulting plan,are shown on the POM for Windows output below.Pierre wants acceptance sampling to remove ALL defects from his production of air cleaners.Explain carefully why this won't happen.

Accepted Answer

Acceptance sampling is not intended to r

Question 6

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 7

A nationwide parcel delivery service keeps track of the number of late deliveries (more than 30 minutes past the time promised to clients)per day.They plan on using a control chart to plot their results.Which type of control chart(s)would you recommend?

Accepted Answer

A) both x-bar chart and R-chart 
B) p-chart 
C) c-chart 
D) x-bar chart 
E) both p-chart and c-chart 
A) both x-bar chart and R-chart 
B) p-chart 
C) c-chart 
D) x-bar chart 
E) both p-chart and c-chart

Question 8

Plots of sample ranges indicate that the most recent value is below the lower control limit.What course of action would you recommend?

Accepted Answer

A) Since there is no obvious pattern in the measurements,variability is in control. 
B) One value outside the control limits is insufficient to warrant any action. 
C) Lower than expected dispersion is a desirable condition;there is no reason to investigate. 
D) The process is out of control;reject the last units produced. 
E) Variation is not in control;investigate what created this condition. 
A) Since there is no obvious pattern in the measurements,variability is in control. 
B) One value outside the control limits is insufficient to warrant any action. 
C) Lower than expected dispersion is a desirable condition;there is no reason to investigate. 
D) The process is out of control;reject the last units produced. 
E) Variation is not in control;investigate what created this condition.

Question 9

Natural variations:

Accepted Answer

A) affect almost every production process. 
B) are the many sources of variation that occur when a process is under control. 
C) when grouped,form a pattern,or distribution. 
D) are tolerated,within limits,when a process is under control. 
E) All of the above are true. 
A) affect almost every production process. 
B) are the many sources of variation that occur when a process is under control. 
C) when grouped,form a pattern,or distribution. 
D) are tolerated,within limits,when a process is under control. 
E) All of the above are true.

Question 10

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.The p-bar
value 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 she be that the true lower limit is greater than or equal to .0064?

Accepted Answer

Sigma-p = sqrt ( .05*(1 - .05)/100)= .02

Question 11

What is the purpose of the Operating Characteristics curve?

Accepted Answer

An OC curve plots the probabil

Question 12

The Cpk index measures the difference between the desired and actual dimensions of goods or services produced.

Accepted Answer

A) True 
 B)False

Question 13

Define consumer's risk.Is it a Type I or Type II error? What is the symbol for its value?

Accepted Answer

The consumer's risk is the pro

Question 14

A Type II error occurs when:

Accepted Answer

A) a good lot is rejected. 
B) a bad lot is accepted. 
C) the population is worse than the LTPD. 
D) the proportion of defectives is very small. 
E) none of the above 
A) a good lot is rejected. 
B) a bad lot is accepted. 
C) the population is worse than the LTPD. 
D) the proportion of defectives is very small. 
E) none of the above

Question 15

Red Top Cab Company receives multiple complaints per day about driver behavior.Over 9 days the owner recorded the number of calls to be 3,0,8,9,6,7,4,9,and 8.What is the upper control limit for the 3-sigma c-chart?

Accepted Answer

A) 13.35 
B) 8.45 
C) 24.00 
D) 0.00 
E) 9.03 
A) 13.35 
B) 8.45 
C) 24.00 
D) 0.00 
E) 9.03

Question 16

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

Accepted Answer

A) likely out of control and the cause should be investigated. 
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) likely out of control and the cause should be investigated. 
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 17

Acceptance sampling's primary purpose is to:

Accepted Answer

A) estimate process quality. 
B) identify processes that are out of control. 
C) detect and eliminate defectives. 
D) decide if a lot meets predetermined standards. 
E) determine whether defective items found in sampling should be replaced. 
A) estimate process quality. 
B) identify processes that are out of control. 
C) detect and eliminate defectives. 
D) decide if a lot meets predetermined standards. 
E) determine whether defective items found in sampling should be replaced.

Question 18

Which of the following is TRUE regarding the average outgoing quality level?

Accepted Answer

A) An AOQ value of 1 is ideal,because all defects have been removed. 
B) AOQ is always greater than AQL but less than LTPD. 
C) AOQ rises (worsens)following inspection of failed lots. 
D) AOQ is very low (very good)for extremely poor quality lots. 
E) None of the above is true. 
A) An AOQ value of 1 is ideal,because all defects have been removed. 
B) AOQ is always greater than AQL but less than LTPD. 
C) AOQ rises (worsens)following inspection of failed lots. 
D) AOQ is very low (very good)for extremely poor quality lots. 
E) None of the above is true.

Question 19

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

Accepted Answer

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

Question 20

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.

Exam 19: Statistical Process Control

What is acceptance sampling?

A process range chart illustrates the amount of dispersion within the samples.

A manager wants to build 3-sigma x-bar control limits for a process.The target value for the mean of the process is 10 units,and the standard deviation of the process is 6.If samples of size 9 are to be taken,what will be the upper and lower control limits,respectively?

An operator trainee is attempting to monitor a filling process that has an overall average of 705 cc.The average range is 17 cc.If you use a sample size of 6,what are the upper and lower control limits for the x-bar chart and R-chart?

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

A nationwide parcel delivery service keeps track of the number of late deliveries (more than 30 minutes past the time promised to clients)per day.They plan on using a control chart to plot their results.Which type of control chart(s)would you recommend?

Plots of sample ranges indicate that the most recent value is below the lower control limit.What course of action would you recommend?

Natural variations:

What is the purpose of the Operating Characteristics curve?

The Cpk index measures the difference between the desired and actual dimensions of goods or services produced.

Define consumer's risk.Is it a Type I or Type II error? What is the symbol for its value?

A Type II error occurs when:

Red Top Cab Company receives multiple complaints per day about driver behavior.Over 9 days the owner recorded the number of calls to be 3,0,8,9,6,7,4,9,and 8.What is the upper control limit for the 3-sigma c-chart?

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

Acceptance sampling's primary purpose is to:

Which of the following is TRUE regarding the average outgoing quality level?

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

The process capability measures Cp and Cpk differ because:

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

Filters