Question 1

An airline company tracks the number of lost bags that occur each day.This is best monitored by which of the following control charts?

Accepted Answer

A) x-bar chart 
B) R-chart 
C) p-chart 
D) c-chart 
E) None of the above 
A) x-bar chart 
B) R-chart 
C) p-chart 
D) c-chart 
E) None of the above

Question 2

Statistical process control uses regression and other forecasting tools to help control processes.

Accepted Answer

A) True 
 B)False

Question 3

Table 15-2
Given the sample results (100 units in each sample):  
-A company has been receiving complaints about the attitude of some sales clerks.Over a 10-day period,the total number of complaints was 360.The company wishes to develop a control chart for the number of complaints.What would the upper control limit on the number of complaints per day be for a 3 sigma (99.7%)control chart?

Accepted Answer

A) 18 
B) 36 
C) 42 
D) 54 
E) None of the above 
A) 18 
B) 36 
C) 42 
D) 54 
E) None of the above

Question 4

A c-chart is based on which of the following probability distributions?

Accepted Answer

A) Poisson 
B) Binomial 
C) Uniform 
D) Exponential 
E) Gamma 
A) Poisson 
B) Binomial 
C) Uniform 
D) Exponential 
E) Gamma

Question 5

A local children's boutique specializes in formal wear for young girls.It has recently hired a new seamstress.To assure the dresses have standard sizes,twenty samples of each 12 dresses that were labeled 3T were sampled.The average length from shoulder to hemline measured 21 inches with a range of 0.5 inches.A sample has just been taken with the following lengths: 21.25,22.0,21.5,20.75,21.25,21.35,21.35,21.35,21.35,21.35,21.35,and 21.35.Is the new seamstress performing at an acceptable quality level?

Accepted Answer

UCL = 21 + 0.5(0.266)= 21.133
LCL = 21 -

Question 6

A company believes a process monitored by an x-bar chart to be in control.When the most recent control point exceeded the UCL value by 20%,the company should

Accepted Answer

A) believe that a random bad luck chance occurred and proceed. 
B) suspect that an assignable cause of variation now exists and can be found. 
C) ignore the control point completely,as it is simply an outlier. 
D) wait for the next four samples to be taken to see if a trend develops. 
E) All of the above 
A) believe that a random bad luck chance occurred and proceed. 
B) suspect that an assignable cause of variation now exists and can be found. 
C) ignore the control point completely,as it is simply an outlier. 
D) wait for the next four samples to be taken to see if a trend develops. 
E) All of the above

Question 7

When a process is out of control,________ variations exist in the process.

Accepted Answer

The answer of When a process is out of control,________...

Question 8

The U.S.government award for quality achievement is the

Accepted Answer

A) Deming Prize. 
B) Shewhart Symbol of Excellence. 
C) Malcolm Baldrige National Quality Award. 
D) Bush Award for Quality Management. 
E) Six Sigma Certification. 
A) Deming Prize. 
B) Shewhart Symbol of Excellence. 
C) Malcolm Baldrige National Quality Award. 
D) Bush Award for Quality Management. 
E) Six Sigma Certification.

Question 9

Match the following.
-Column 1:   ± z σp
Column 2: Control limits for a p-chart

Accepted Answer

Control li

Question 10

The central limit theorem provides the statistical foundation for control charts.

Accepted Answer

A) True 
 B)False

Question 11

A retail store charts the number of customer returns per day.Under normal conditions,the store expects 10 customer returns per day.During the past 10 days,the observed customer returns were as follows: 12,9,8,14,8,13,8,10,9,11.Using 99.7% control limits,is the process under control?

Accepted Answer

The process is in co

Question 12

C-charts are used to analyze the proportion defective in a sample.

Accepted Answer

A) True 
 B)False

Question 13

A plant manager is concerned with the variability of beer being filled in 12 oz.cans.The most appropriate control chart would be which of the following?

Accepted Answer

A) x-bar chart 
B) R-chart 
C) p-chart 
D) c-chart 
E) None of the above 
A) x-bar chart 
B) R-chart 
C) p-chart 
D) c-chart 
E) None of the above

Question 14

Explain the difference between an x-bar chart and a R-chart.

Accepted Answer

X-bar charts are used to monit

Question 15

When receiving a shipment from a supplier,inspection must be done to check the fraction of defective products.This is best monitored by which of the following control charts?

Accepted Answer

A) x-bar chart 
B) R-chart 
C) p-chart 
D) c-chart 
E) None of the above 
A) x-bar chart 
B) R-chart 
C) p-chart 
D) c-chart 
E) None of the above

Question 16

The   -chart would be useful when we

Accepted Answer

A) took a number of measurements and computed the average. 
B) took a number of measurements and computed the ranges. 
C) found the fraction of the production lot defective. 
D) found the number of defective items in a production lot. 
E) None of the above 
A) took a number of measurements and computed the average. 
B) took a number of measurements and computed the ranges. 
C) found the fraction of the production lot defective. 
D) found the number of defective items in a production lot. 
E) None of the above

Question 17

A coffee dispenser is supposed to dispense coffee into an 8 o.z.cup.The average amount of coffee filled into the cup must be below 7.9.This is best monitored by which of the following control charts?

Accepted Answer

A) x-bar chart 
B) R-chart 
C) p-chart 
D) c-chart 
E) None of the above 
A) x-bar chart 
B) R-chart 
C) p-chart 
D) c-chart 
E) None of the above

Question 18

Technically,to achieve Six Sigma quality,there would have to be fewer than ________ defects per million opportunities.

Accepted Answer

The answer of Technically,to achieve Six Sigma quality,there would have...

Question 19

For the problems which follow,match the following.
-Column 1: p-chart
Column 2: Fraction of attributes

Accepted Answer

Fraction o

Question 20

Table 15-1  
-Refer to Table 15-1.The average range of a process for packaging cereal is 1.1 ounces.If the sample size is 10,find the lower control chart limit for the range chart.

Accepted Answer

A) 0.245 
B) 1.955 
C) 1.777 
D) 0.223 
E) None of the above 
A) 0.245 
B) 1.955 
C) 1.777 
D) 0.223 
E) None of the above

Exam 15: Statistical Quality Control

An airline company tracks the number of lost bags that occur each day.This is best monitored by which of the following control charts?

Statistical process control uses regression and other forecasting tools to help control processes.

A c-chart is based on which of the following probability distributions?

A company believes a process monitored by an x-bar chart to be in control.When the most recent control point exceeded the UCL value by 20%,the company should

When a process is out of control,________ variations exist in the process.

The U.S.government award for quality achievement is the

Match the following. -Column 1: ± z σp Column 2: Control limits for a p-chart

The central limit theorem provides the statistical foundation for control charts.

A retail store charts the number of customer returns per day.Under normal conditions,the store expects 10 customer returns per day.During the past 10 days,the observed customer returns were as follows: 12,9,8,14,8,13,8,10,9,11.Using 99.7% control limits,is the process under control?

C-charts are used to analyze the proportion defective in a sample.

A plant manager is concerned with the variability of beer being filled in 12 oz.cans.The most appropriate control chart would be which of the following?

Explain the difference between an x-bar chart and a R-chart.

When receiving a shipment from a supplier,inspection must be done to check the fraction of defective products.This is best monitored by which of the following control charts?

The -chart would be useful when we

A coffee dispenser is supposed to dispense coffee into an 8 o.z.cup.The average amount of coffee filled into the cup must be below 7.9.This is best monitored by which of the following control charts?

Technically,to achieve Six Sigma quality,there would have to be fewer than ________ defects per million opportunities.

For the problems which follow,match the following. -Column 1: p-chart Column 2: Fraction of attributes

Table 15-1 -Refer to Table 15-1.The average range of a process for packaging cereal is 1.1 ounces.If the sample size is 10,find the lower control chart limit for the range chart.

Introduction to Quantitative Analysis

Probability Concepts and Applications

Decision Analysis

Regression Models

Forecasting

Inventory Control Models

Linear Programming Models: Graphical and Computer Methods

Linear Programming Applications

Transportation,assignment,and Network Models

Integer Programming,goal Programming,and Nonlinear Programming

Project Management

Waiting Lines and Queuing Theory Models

Simulation Modeling

Markov Analysis

Analytic Hierarchy Process

Dynamic Programming

Decision Theory and the Normal Distribution

Game Theory

Mathematical Tools: Determinants and Matrices

Calculus-Based Optimization

Linear Programming: The Simplex Method

Transportation, Assignment, and Network Algorithms

Filters

Match the following. -Column 1: ± z σ_p Column 2: Control limits for a p-chart