Question 1

Control charts based on attribute data are for process characteristics that are counted rather than measured.

Accepted Answer

A) True 
 B)False

Question 2

If a point on a control chart falls outside one of the control limits,this suggests that the process output is non-random,assignable variation.

Accepted Answer

A) True 
 B)False

Question 3

The purpose of control charts is to:

Accepted Answer

A) estimate the proportion of output that is acceptable. 
B) inspect the quality of all outputs from a process. 
C) determine if the output of a process is within specifications. 
D) distinguish between random variation and assignable variation in a process. 
A) estimate the proportion of output that is acceptable. 
B) inspect the quality of all outputs from a process. 
C) determine if the output of a process is within specifications. 
D) distinguish between random variation and assignable variation in a process.

Question 4

A design engineer wants to construct a sample mean chart for controlling the service life of one of the types of light bulbs his company produces.He knows from numerous previous samples that this service life is normally distributed with a mean of 500 hours and a standard deviation of 20 hours.On three recent production batches,he tested service life on random samples of four bulbs,with these results:   If he uses upper and lower control limits of 520 and 480 hours,what is his risk (alpha)of concluding service life is out of control when it is actually under control (Type I error)?

Accepted Answer

A) 0.0026 
B) 0.0456 
C) 0.3174 
D) 0.6826 
E) 0.9544 
A) 0.0026 
B) 0.0456 
C) 0.3174 
D) 0.6826 
E) 0.9544

Question 5

Process variability is a key factor in process capability.

Accepted Answer

A) True 
 B)False

Question 6

Attributes are process characteristics that must be measured rather than counted.

Accepted Answer

A) True 
 B)False

Question 7

Design of experiments involves performing experiments to determine the best control limits for a process.

Accepted Answer

A) True 
 B)False

Question 8

A Quality Analyst wants to construct a sample mean chart for controlling a packaging process.He knows from past experience that whenever this process is under control,package weight is normally distributed with a mean of twenty ounces and a standard deviation of two ounces.Each day last week,he randomly selected four packages and weighed each with the following results:   If he uses upper and lower control limits of 23 and 17 ounces,what is his risk of concluding this process is in control when it is actually out of control (Type II error)?

Accepted Answer

A) 0.0026 
B) 0.0456 
C) 0.3174 
D) 0.6826 
E) 0.9544 
A) 0.0026 
B) 0.0456 
C) 0.3174 
D) 0.6826 
E) 0.9544

Question 9

The optimum level of inspection minimizes the sum of inspection costs and the cost of passing defectives.

Accepted Answer

A) True 
 B)False

Question 10

Given the following process control data for a normally distributed quality variable (three samples of size four each):
   If the process is known to have a mean of 15 and a standard deviation of 3,what is the mean of the sampling distribution of sample means for whenever this process is under control? The standard deviation?

Accepted Answer

The answer of Given the following process control data for...

Question 11

A Quality Analyst wants to construct a control chart for determining whether four machines,all producing the same product,are under control with regard to a particular quality attribute.Accordingly,she inspected 1,000 units of output from each machine in random samples,with the following results:   What is the estimate of the standard deviation of the sampling distribution of the sample proportion based on the samples for these four machines?

Accepted Answer

A) .016 
B) .00016 
C) .04 
D) .0044 
E) .00002 
A) .016 
B) .00016 
C) .04 
D) .0044 
E) .00002

Question 12

Even when the sample size is fairly small,the sampling distribution can be assumed to be approximately normal even if the underlying process distribution is not normally distributed.

Accepted Answer

A) True 
 B)False

Question 13

A process is "capable" if the process output falls within the design specification.

Accepted Answer

A) True 
 B)False

Question 14

When using control charts sample size is important.Smaller samples are more likely to reveal a process change because a change is more likely to take place ______ the large sample,rather than ________ small samples.

Accepted Answer

A) outside,outside 
B) outside,inside 
C) exclusive to,inside, 
D) between,outside 
E) within,between 
A) outside,outside 
B) outside,inside 
C) exclusive to,inside, 
D) between,outside 
E) within,between

Question 15

The end of a manufacturing process is always the best place for a quality inspection point.

Accepted Answer

A) True 
 B)False

Question 16

The variability of a process output is equivalent to the distribution of sample means of that process output for any sample size taken from the process.

Accepted Answer

A) True 
 B)False

Question 17

Studies on a bottle-filling machine indicates it fills bottles to a mean of 16 ounces with a standard deviation of 0.10 ounces.Assuming the Cpindex = 1.0,what is/are the process specification(s)?

Accepted Answer

A) 0.10 ounces. 
B) 0.60 ounces. 
C) 16.0 ounces plus or minus 0.60 ounces. 
D) 16.0 ounces plus or minus 0.30 ounces. 
A) 0.10 ounces. 
B) 0.60 ounces. 
C) 16.0 ounces plus or minus 0.60 ounces. 
D) 16.0 ounces plus or minus 0.30 ounces.

Question 18

Which statement is an accurate description of a process that is "capable"?

Accepted Answer

A) No random variation is evident,only assignable variation. 
B) Process variability is greater than variation allowed by design specifications. 
C) Process variability is less than variation allowed by design specifications. 
D) Assignable variation is less than random variation. 
E) Assignable variation is greater than random variation. 
A) No random variation is evident,only assignable variation. 
B) Process variability is greater than variation allowed by design specifications. 
C) Process variability is less than variation allowed by design specifications. 
D) Assignable variation is less than random variation. 
E) Assignable variation is greater than random variation.

Question 19

The sample size chosen for control charts depends on the cost of inspection versus the expected cost of Type II error.

Accepted Answer

A) True 
 B)False

Question 20

Construct the appropriate control chart for the sample observations listed below,and determine if the process is in control using two sigma limits.
 11eab92b_c48d_7a8d_99e6_d5c0e9bbbd7a

Accepted Answer

The initial value is

Exam 15: Statistical Quality Control

Control charts based on attribute data are for process characteristics that are counted rather than measured.

If a point on a control chart falls outside one of the control limits,this suggests that the process output is non-random,assignable variation.

The purpose of control charts is to:

Process variability is a key factor in process capability.

Attributes are process characteristics that must be measured rather than counted.

Design of experiments involves performing experiments to determine the best control limits for a process.

The optimum level of inspection minimizes the sum of inspection costs and the cost of passing defectives.

Even when the sample size is fairly small,the sampling distribution can be assumed to be approximately normal even if the underlying process distribution is not normally distributed.

A process is "capable" if the process output falls within the design specification.

When using control charts sample size is important.Smaller samples are more likely to reveal a process change because a change is more likely to take place ______ the large sample,rather than ________ small samples.

The end of a manufacturing process is always the best place for a quality inspection point.

The variability of a process output is equivalent to the distribution of sample means of that process output for any sample size taken from the process.

Studies on a bottle-filling machine indicates it fills bottles to a mean of 16 ounces with a standard deviation of 0.10 ounces.Assuming the Cpindex = 1.0,what is/are the process specification(s)?

Which statement is an accurate description of a process that is "capable"?

The sample size chosen for control charts depends on the cost of inspection versus the expected cost of Type II error.

Construct the appropriate control chart for the sample observations listed below,and determine if the process is in control using two sigma limits. 11eab92b_c48d_7a8d_99e6_d5c0e9bbbd7a

Introduction to Operations Management

Competitiveness, strategic Planning, and Productivity

Demand Forecasting

Product Design

Reliability

Strategic Capacity Planning

Decision Analysis

Process Design and Facility Layout

Linear Programming

Workjob Design

Learning Curves

Location Planning and Analysis

the Transportation Model

Management of Quality

Acceptance Sampling

Supply Chain Management

Inventory Management

Aggregate Operations Planning and Master Scheduling

Material Requirements Planning and Enterprise Resource Planning

Just-In-Time and Lean Production

Maintenance

Job and Staff Scheduling

Project Management

Waiting-Line Analysis

Simulation

Filters

When using control charts sample size is important.Smaller samples are more likely to reveal a process change because a change is more likely to take place the large sample,rather than __ small samples.