Question 1

A(n)________ is a graph that describes how well an acceptance plan discriminates between good and bad lots.

Accepted Answer

OC or oper

Question 2

Which of the following is true of a p-chart?

Accepted Answer

A) The lower control limit is found by subtracting a fraction from the average number of defects. 
B) The lower control limit indicates the minimum acceptable number of defects. 
C) The lower control limit equals D3 times p-bar. 
D) The lower control limit may be at zero. 
E) The lower control limit is the same as the lot tolerance percent defective. 
A) The lower control limit is found by subtracting a fraction from the average number of defects. 
B) The lower control limit indicates the minimum acceptable number of defects. 
C) The lower control limit equals D3 times p-bar. 
D) The lower control limit may be at zero. 
E) The lower control limit is the same as the lot tolerance percent defective.

Question 3

To set x-bar chart upper and lower control limits,one must know the process central line,which is the:

Accepted Answer

A) average of the sample means. 
B) total number of defects in the population. 
C) percent defects in the population. 
D) size of the population. 
E) average range. 
A) average of the sample means. 
B) total number of defects in the population. 
C) percent defects in the population. 
D) size of the population. 
E) average range.

Question 4

The mean and standard deviations for a process are μ = 90 and σ = 9,respectively.For the variable control chart,a sample size of 16 will be used.Calculate the standard deviation of the sample means.

Accepted Answer

Sigma x-ba

Question 5

Ten samples of a process measuring the number of returns per 100 receipts were taken for a local retail store.The number of returns were 10,9,11,7,3,12,8,4,6,and 11.Find the standard deviation of the sampling distribution for the p-bar chart.

Accepted Answer

A) There is not enough information to answer the question. 
B) .081 
C) 8.1 
D) .0273 
E) .0863 
A) There is not enough information to answer the question. 
B) .081 
C) 8.1 
D) .0273 
E) .0863

Question 6

Up to three standard deviations above or below the centerline is the amount of variation that statistical process control allows for:

Accepted Answer

A) Type I errors. 
B) about 95.5% variation. 
C) natural variation. 
D) all types of variation. 
E) assignable variation. 
A) Type I errors. 
B) about 95.5% variation. 
C) natural variation. 
D) all types of variation. 
E) assignable variation.

Question 7

The c-chart signals whether there has been a:

Accepted Answer

A) gain or loss in uniformity. 
B) change in the number of defects per unit. 
C) change in the central tendency of the process output. 
D) change in the percent defective in a sample. 
E) change in the AOQ. 
A) gain or loss in uniformity. 
B) change in the number of defects per unit. 
C) change in the central tendency of the process output. 
D) change in the percent defective in a sample. 
E) change in the AOQ.

Question 8

The specifications for a manifold gasket that installs between two engine parts calls for a thickness of 2.500 mm ± .020 mm.The standard deviation of the process is estimated to be 0.004 mm.The process is currently operating at a mean thickness of 2.50 mm.(a)What are the upper and lower specification limits for this product? (b)What is the Cp for this process? (c)The purchaser of these parts requires a capability index of 1.50.Is this process capable? Is this process good enough for the supplier? (d)If the process mean were to drift from its setting of 2.500 mm to a new mean of 2.497,would the process still be good enough for the supplier's needs?

Accepted Answer

(a)LSL = 2.48 mm,USL = 2.52 mm.(b)Cp = (

Question 9

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

Accepted Answer

A) 6 
B) 1 
C) 1.33 
D) 1.67 
E) 2 
A) 6 
B) 1 
C) 1.33 
D) 1.67 
E) 2

Question 10

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) none of the above. 
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) none of the above.

Question 11

Some degree of variability is present in almost all processes.

Accepted Answer

A) True 
 B)False

Question 12

An acceptance sampling plan's ability to discriminate between low quality lots and high quality lots is described by:

Accepted Answer

A) a Gantt chart. 
B) the Central Limit Theorem. 
C) a process control chart. 
D) an operating characteristic curve. 
E) a range chart. 
A) a Gantt chart. 
B) the Central Limit Theorem. 
C) a process control chart. 
D) an operating characteristic curve. 
E) a range chart.

Question 13

Averages of small samples,not individual measurements,are generally used in statistical process control.

Accepted Answer

A) True 
 B)False

Question 14

Why do range charts exist? Aren't x-bar charts enough?

Accepted Answer

Range charts and mean charts perform dif

Question 15

A department chair wants to monitor the percentage of failing students in classes in her department.Each class had an enrollment of 50 students last spring.The number of failing students in the 10 classes offered that term were 1,4,2,0,0,0,0,0,0,and 3,respectively.Compute the control limits for a p-chart at the 95% confidence level.Is the process in control?

Accepted Answer

From Table S6.2,the z-value = 1.96.
The

Question 16

What is the AOQ of an acceptance sampling plan?

Accepted Answer

The AOQ is the average outgoin

Question 17

Ten samples of size four were taken from a process,and their weights measured.The sample averages and sample ranges are in the following table.Construct and plot an x-bar and R-chart using these data.Is the process in control?

Accepted Answer

@#IMG-DLM& @#IMG-DLM& The x-bar chart is out of co

Question 18

A process is operating in such a manner that the mean of the process is exactly on the lower specification limit.What must be true about the two measures of capability for this process?

Accepted Answer

The Cp ratio does not consider how well

Question 19

The ________ is a quality control chart used to control the number of defects per unit of output.

Accepted Answer

The answer of The ________ is a quality control chart...

Question 20

The higher the process capability ratio,the greater the likelihood that process will be within design specifications.

Accepted Answer

A) True 
 B)False

Exam 19: Statistical Process Control

A(n)________ is a graph that describes how well an acceptance plan discriminates between good and bad lots.

Which of the following is true of a p-chart?

To set x-bar chart upper and lower control limits,one must know the process central line,which is the:

The mean and standard deviations for a process are μ = 90 and σ = 9,respectively.For the variable control chart,a sample size of 16 will be used.Calculate the standard deviation of the sample means.

Ten samples of a process measuring the number of returns per 100 receipts were taken for a local retail store.The number of returns were 10,9,11,7,3,12,8,4,6,and 11.Find the standard deviation of the sampling distribution for the p-bar chart.

Up to three standard deviations above or below the centerline is the amount of variation that statistical process control allows for:

The c-chart signals whether there has been a:

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

An operating characteristic (OC)curve describes:

Some degree of variability is present in almost all processes.

An acceptance sampling plan's ability to discriminate between low quality lots and high quality lots is described by:

Averages of small samples,not individual measurements,are generally used in statistical process control.

Why do range charts exist? Aren't x-bar charts enough?

What is the AOQ of an acceptance sampling plan?

Ten samples of size four were taken from a process,and their weights measured.The sample averages and sample ranges are in the following table.Construct and plot an x-bar and R-chart using these data.Is the process in control?

A process is operating in such a manner that the mean of the process is exactly on the lower specification limit.What must be true about the two measures of capability for this process?

The ________ is a quality control chart used to control the number of defects per unit of output.

The higher the process capability ratio,the greater the likelihood that process will be within design specifications.

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

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