Question 1

What is the standard deviation of the sampling distribution of sample means for whenever service life is in control?

Accepted Answer

A) 5 hours 
B) 6.67 hours 
C) 10 hours 
D) 11.55 hours 
E) 20 hours 
A) 5 hours 
B) 6.67 hours 
C) 10 hours 
D) 11.55 hours 
E) 20 hours

Question 2

What are the control chart upper and lower control limits for an alpha risk of .05?

Accepted Answer

A) .0272 and .0128 
B) .0287 and .0113 
C) .029 and .013 
D) .0303 and .0097 
E) .0332 and .0068 
A) .0272 and .0128 
B) .0287 and .0113 
C) .029 and .013 
D) .0303 and .0097 
E) .0332 and .0068

Question 3

"Assignable variation" is variation due to a specific cause, such as tool wear.

Accepted Answer

A) True 
 B)False

Question 4

If a process is performing as it should, it is still possible to obtain observations which are outside of which limits? (I) tolerances
(II) control limits
(III) process variability

Accepted Answer

A) I 
B) II 
C) I and II 
D) II and III 
E) I, II, and III 
A) I 
B) II 
C) I and II 
D) II and III 
E) I, II, and III

Question 5

The probability of concluding that assignable variation exists when only random variation is present is: (I) the probability of a Type I error
(II) known as the alpha risk
(III) highly unlikely
(IV) the sum of probabilities in the two tails of the normal distribution

Accepted Answer

A) I and II 
B) I and IV 
C) II and III 
D) I, II, and IV 
E) I, III, and IV 
A) I and II 
B) I and IV 
C) II and III 
D) I, II, and IV 
E) I, III, and IV

Question 6

_______ variation is a variation whose cause can be identified.

Accepted Answer

A) Assignable 
B) Controllable 
C) Random 
D) Statistical 
E) Theoretical 
A) Assignable 
B) Controllable 
C) Random 
D) Statistical 
E) Theoretical

Question 7

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 8

Patterns of data on a control chart suggest that the process may have non-random variation.

Accepted Answer

A) True 
 B)False

Question 9

The larger the process variation, the tighter the specifications should be.

Accepted Answer

A) True 
 B)False

Question 10

A c-chart is used to monitor the total number of defectives in the output of a process.

Accepted Answer

A) True 
 B)False

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

Range control charts are used to monitor process central tendency.

Accepted Answer

A) True 
 B)False

Question 13

A process that makes chocolate candy bars has an output that is normally distributed with a mean of 6 oz.and a standard deviation of .01 oz.A job is to be run that requires 200 candy bars.
Determine three sigma control limits for an x-bar chart assuming a sample size of 10.
If specifications are 5.98 to 6.02, what run size should be used for this job so that the expected number of good candy bars is 200, assuming the process is in control?

Accepted Answer

The answer of A process that makes chocolate candy bars...

Question 14

The number of defective parts in a sample is an example of variable data because it will "vary" from one sample to another.

Accepted Answer

A) True 
 B)False

Question 15

The variation of a sampling distribution is tighter than the variation of the underlying process distribution.

Accepted Answer

A) True 
 B)False

Question 16

A run test checks a sequence of observations for randomness.

Accepted Answer

A) True 
 B)False

Question 17

Organizations should work to improve process capability so that quality control efforts can become more ________.

Accepted Answer

A) effective 
B) efficient 
C) necessary 
D) unnecessary 
E) widespread 
A) effective 
B) efficient 
C) necessary 
D) unnecessary 
E) widespread

Question 18

The sampling distribution can be assumed to be approximately normal even when the underlying process distribution is not normally distributed.

Accepted Answer

A) True 
 B)False

Question 19

What is the estimate of the process mean for whenever it is under control?

Accepted Answer

A) 16 
B) 19 
C) 20 
D) 21 
E) 23 
A) 16 
B) 19 
C) 20 
D) 21 
E) 23

Question 20

When a process is in control, it results in there being, on average, 16 defects per unit of output.C-chart limits of 4 and 28 would lead to a _______ chance of a Type I error.

Accepted Answer

A) 67% 
B) 92% 
C) 33% 
D) 0.3% 
E) 5% 
A) 67% 
B) 92% 
C) 33% 
D) 0.3% 
E) 5%

Exam 10: Quality Control

What is the standard deviation of the sampling distribution of sample means for whenever service life is in control?

What are the control chart upper and lower control limits for an alpha risk of .05?

"Assignable variation" is variation due to a specific cause, such as tool wear.

If a process is performing as it should, it is still possible to obtain observations which are outside of which limits? (I) tolerances (II) control limits (III) process variability

The probability of concluding that assignable variation exists when only random variation is present is: (I) the probability of a Type I error (II) known as the alpha risk (III) highly unlikely (IV) the sum of probabilities in the two tails of the normal distribution

_______ variation is a variation whose cause can be identified.

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)?

Patterns of data on a control chart suggest that the process may have non-random variation.

The larger the process variation, the tighter the specifications should be.

A c-chart is used to monitor the total number of defectives in the output of a process.

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

Range control charts are used to monitor process central tendency.

The number of defective parts in a sample is an example of variable data because it will "vary" from one sample to another.

The variation of a sampling distribution is tighter than the variation of the underlying process distribution.

A run test checks a sequence of observations for randomness.

Organizations should work to improve process capability so that quality control efforts can become more ________.

The sampling distribution can be assumed to be approximately normal even when the underlying process distribution is not normally distributed.

What is the estimate of the process mean for whenever it is under control?

When a process is in control, it results in there being, on average, 16 defects per unit of output.C-chart limits of 4 and 28 would lead to a _______ chance of a Type I error.

Introduction to Operations Management

Competitiveness, Strategy, and Productivity

Forecasting

Product and Service Design

Strategic Capacity Planning for Products and Services

Process Selection and Facility Layout

Work Design and Measurement

Location Planning and Analysis

Management of Quality

Aggregate Planning and Master Scheduling

MRP and ERP

Inventory Management

Jit and Lean Operations

Supply Chain Management

Scheduling

Project Management

Management of Waiting Lines

Linear Programming

Extension 4: Reliability

Extension 5: Decision Theory

Extension 7: Learning Curves

Extension 8: The Transportation Model

Extension 10: Acceptance Sampling

Extension 14: Maintenance

Filters