Question 1

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.

Question 2

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 3

A retail store manager is trying to improve and control the rate at which cashiers sign customers up
for store credit cards.After posting a p-chart of the store's credit card sign-ups the manager takes
new samples of size 50 three weeks later.He finds that each sample of 50 contained 5 credit card
signups on average.Find p-bar and 99.73% control limits.

Accepted Answer

P-bar = 5/50 = .1 or 10%.Sigma-p = sqrt(

Question 4

Statistical process control charts

Accepted Answer

A) display the measurements on every item being produced. 
B) display upper and lower limits for process variables or attributes,and signal when a process is no longer in control. 
C) indicate to the process operator the average outgoing quality of each lot. 
D) indicate to the operator the true quality of material leaving the process. 
E) display the measurements on every item being purchased. 
A) display the measurements on every item being produced. 
B) display upper and lower limits for process variables or attributes,and signal when a process is no longer in control. 
C) indicate to the process operator the average outgoing quality of each lot. 
D) indicate to the operator the true quality of material leaving the process. 
E) display the measurements on every item being purchased.

Question 5

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.

Accepted Answer

This plan does not meet the sp

Question 6

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

Question 7

The steeper an OC curve,the better it discriminates between good and bad lots.

Accepted Answer

A) True 
 B)False

Question 8

A small,independent amusement park collects data on the number of cars with out-of-state license plates.The sample size is fixed at n = 25 each day.Data from the previous 10 days indicate the following number of out-of-state license plates:
   (a)Calculate the overall proportion of "tourists" (cars with out-of-state plates)and the standard deviation of proportions.
(b)Using ± 3σ limits,calculate the LCL and UCL for these data.
(c)Is the process under control? Explain.

Accepted Answer

(a)p-bar is 56/250 = 0.224;the standard

Question 9

The ________ are calculated to show how much allowance should be made for natural variation.

Accepted Answer

UCL and LC

Question 10

The statistical definition of Six Sigma allows for 3.4 defects per million.This is achieved by a Cpk index of

Accepted Answer

A) 0. 
B) 1. 
C) 1.33. 
D) 1.67. 
E) 2. 
A) 0. 
B) 1. 
C) 1.33. 
D) 1.67. 
E) 2.

Question 11

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) how many defects per lot are permitted before rejection occurs. 
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) how many defects per lot are permitted before rejection occurs.

Question 12

The ________ is the percent defective in an average lot of goods inspected through acceptance sampling.

Accepted Answer

AOQ or ave

Question 13

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 14

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

Accepted Answer

A)    -chart. 
B) R-chart. 
C) p-chart. 
D) AOQ chart. 
E) c-chart. 
A)    -chart. 
B) R-chart. 
C) p-chart. 
D) AOQ chart. 
E) c-chart.

Question 15

A part that connects two levels should have a distance between the two holes of 4".It has been determined that x-bar and R-charts should be set up to determine if the process is in statistical control.The following ten samples of size four were collected.Calculate the control limits,plot the control charts,and determine if the process is in control.

Accepted Answer

@#IMG-DLM& @#IMG-DLM& The process is out

Question 16

The causes of variation in statistical process control are

Accepted Answer

A) cycles,trends,seasonality,and random variations. 
B) producer's causes and consumer's causes. 
C) mean and range. 
D) natural causes and assignable causes. 
E) Type I and Type II. 
A) cycles,trends,seasonality,and random variations. 
B) producer's causes and consumer's causes. 
C) mean and range. 
D) natural causes and assignable causes. 
E) Type I and Type II.

Question 17

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) a good lot is accepted. 
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) a good lot is accepted.

Question 18

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)= .02

Question 19

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 in the text, @#IMG-DLM& = .577 @#IMG-DLM& =

Question 20

A c-chart is appropriate to plot the number of flaws in a bolt of fabric.

Accepted Answer

A) True 
 B)False

Average outgoing quality (AOQ)usually

Statistical process control charts

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

The steeper an OC curve,the better it discriminates between good and bad lots.

The ________ are calculated to show how much allowance should be made for natural variation.

The statistical definition of Six Sigma allows for 3.4 defects per million.This is achieved by a Cpk index of

An operating characteristic (OC)curve describes

The ________ is the percent defective in an average lot of goods inspected through acceptance sampling.

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

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

The causes of variation in statistical process control are

A Type I error occurs when

A c-chart is appropriate to plot the number of flaws in a bolt of fabric.

Operations and Productivity

Operations Strategy in a Global Environment

Project Management

Forecasting

Sustainability in the Supply Chain and Design of Goods and Services

Managing Quality

Process Strategy and Sustainability

Location Strategies

Layout Strategies

Human Resources,job Design,and Work Measurement

Supply-Chain Management

Inventory Management

Aggregate Planning

Material Requirements Planning Mrpand ERP

Short-Term Scheduling

Jit and Lean Operations

Maintenance and Reliability

Capacity and Constraint Management

Supply Chain Management Analytics

Decision-Making Tools

Linear Programming

Transportation Models

Waiting-Line Models

Learning Curves

Simulation

Filters

Exam 18: Statistical Process Control

Average outgoing quality (AOQ)usually

Statistical process control charts

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

The steeper an OC curve,the better it discriminates between good and bad lots.

The ________ are calculated to show how much allowance should be made for natural variation.

The statistical definition of Six Sigma allows for 3.4 defects per million.This is achieved by a Cpk index of

An operating characteristic (OC)curve describes

The ________ is the percent defective in an average lot of goods inspected through acceptance sampling.

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

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

The causes of variation in statistical process control are

A Type I error occurs when

A c-chart is appropriate to plot the number of flaws in a bolt of fabric.

Operations and Productivity

Operations Strategy in a Global Environment

Project Management

Forecasting

Sustainability in the Supply Chain and Design of Goods and Services

Managing Quality

Process Strategy and Sustainability

Location Strategies

Layout Strategies

Human Resources,job Design,and Work Measurement

Supply-Chain Management

Inventory Management

Aggregate Planning

Material Requirements Planning Mrpand ERP

Short-Term Scheduling

Jit and Lean Operations

Maintenance and Reliability

Capacity and Constraint Management

Supply Chain Management Analytics

Decision-Making Tools

Linear Programming

Transportation Models

Waiting-Line Models

Learning Curves

Simulation

Filters