Question 1

Which of the following is TRUE regarding the average outgoing quality level?

Accepted Answer

A) An AOQ value of 1 is ideal,because all defects have been removed. 
B) AOQ is always greater than AQL but less than LTPD. 
C) AOQ rises (worsens)following inspection of failed lots. 
D) AOQ is very low (very good)for extremely poor quality lots. 
E) None of the above is true. 
A) An AOQ value of 1 is ideal,because all defects have been removed. 
B) AOQ is always greater than AQL but less than LTPD. 
C) AOQ rises (worsens)following inspection of failed lots. 
D) AOQ is very low (very good)for extremely poor quality lots. 
E) None of the above is true.

Question 2

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 3

For a 3-sigma x-bar chart where the process standard deviation is known,the upper control limit:

Accepted Answer

A) is 3σ below the mean of sample means for a 3σ control chart. 
B) is 3σ above the mean of sample means for a 3σ control chart. 
C) is 3σ/   below the mean of sample means for a 3σ control chart. 
D) is 3σ/   above the mean of sample means for a 3σ control chart. 
E) cannot be calculated unless the average range is known. 
A) is 3σ below the mean of sample means for a 3σ control chart. 
B) is 3σ above the mean of sample means for a 3σ control chart. 
C) is 3σ/   below the mean of sample means for a 3σ control chart. 
D) is 3σ/   above the mean of sample means for a 3σ control chart. 
E) cannot be calculated unless the average range is known.

Question 4

A lot that is accepted by acceptance sampling is certified to be free of defects.

Accepted Answer

A) True 
 B)False

Question 5

The x-bar chart,like the c-chart,is based on the exponential distribution.

Accepted Answer

A) True 
 B)False

Question 6

Under which of the following situations will the average outgoing quality (AOQ)decrease?

Accepted Answer

A) The true percentage defective of the lot increases. 
B) The number of items in the sample decreases. 
C) The number of items in the lot decreases. 
D) The probability of accepting the lot for a given sample size and quantity defective increases. 
E) The difference between the number of items in the lot and the number of items in the sample increases. 
A) The true percentage defective of the lot increases. 
B) The number of items in the sample decreases. 
C) The number of items in the lot decreases. 
D) The probability of accepting the lot for a given sample size and quantity defective increases. 
E) The difference between the number of items in the lot and the number of items in the sample increases.

Question 7

Pierre's Motorized Pirogues and Mudboats is setting up an acceptance sampling plan for the special air cleaners he manufactures for his boats.His specifications,and the resulting plan,are shown on the POM for Windows output below.Pierre is a bit confused.He mistakenly thinks that acceptance sampling will reject all bad lots and accept all good lots.Explain why this will not happen.

Accepted Answer

Acceptance sampling cannot discriminate

Question 8

Acceptance sampling:

Accepted Answer

A) may involve inspectors taking random samples (or batches)of finished products and measuring them against predetermined standards. 
B) may involve inspectors taking random samples (or batches)of incoming raw materials and measuring them against predetermined standards. 
C) is more economical than 100% inspection. 
D) may be either of a variable or attribute type,although attribute inspection is more common in the business environment. 
E) All of the above are true. 
A) may involve inspectors taking random samples (or batches)of finished products and measuring them against predetermined standards. 
B) may involve inspectors taking random samples (or batches)of incoming raw materials and measuring them against predetermined standards. 
C) is more economical than 100% inspection. 
D) may be either of a variable or attribute type,although attribute inspection is more common in the business environment. 
E) All of the above are true.

Question 9

A quality analyst wants to construct a sample mean chart for controlling a packaging process.He knows from past experience that when the process is operating as intended,packaging weight is normally distributed with a mean of twenty ounces,and a process standard deviation of two ounces.Each day last week,he randomly selected four packages and weighed each.The data from that activity appear below.
   (a)If he sets an upper control limit of 21 and a lower control limit of 19 around the target value of twenty ounces,the control chart is based on what value of z?
(b)With the UCL and LCL of part a,what do you conclude about this process-is it in control?

Accepted Answer

(a)These control limits are one standard

Question 10

Consumer's risk is the probability of:

Accepted Answer

A) accepting a good lot. 
B) rejecting a good lot. 
C) rejecting a bad lot. 
D) accepting a bad lot. 
E) none of the above 
A) accepting a good lot. 
B) rejecting a good lot. 
C) rejecting a bad lot. 
D) accepting a bad lot. 
E) none of the above

Question 11

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 12

What is the difference between the process capability ratio Cp and the process capability index Cpk?

Accepted Answer

The Cp ratio does not consider how well

Question 13

A Cpk index greater than ________ is a capable process,one that generates fewer than 2.7 defects per 1000 at the ±3σ level.

Accepted Answer

The answer of A Cpk index greater than ________ is...

Question 14

An x-bar control chart was examined and no data points fell outside of the limits.Can this process be considered in control?

Accepted Answer

A) Not yet,there could be a pattern to the points. 
B) Not yet,the R-chart must be checked. 
C) Not yet,the number of samples must be known. 
D) Yes. 
E) Both A and B 
A) Not yet,there could be a pattern to the points. 
B) Not yet,the R-chart must be checked. 
C) Not yet,the number of samples must be known. 
D) Yes. 
E) Both A and B

Question 15

Which of the following is true regarding the relationship between AOQ and the true population percent defective?

Accepted Answer

A) AOQ is greater than the true percent defective. 
B) AOQ is the same as the true percent defective. 
C) AOQ is less than the true percent defective. 
D) There is no relationship between AOQ and the true percent defective. 
E) The relationship between these two cannot be determined. 
A) AOQ is greater than the true percent defective. 
B) AOQ is the same as the true percent defective. 
C) AOQ is less than the true percent defective. 
D) There is no relationship between AOQ and the true percent defective. 
E) The relationship between these two cannot be determined.

Question 16

A normal distribution is generally described by its two parameters: the mean and the range.

Accepted Answer

A) True 
 B)False

Question 17

Pierre's Motorized Pirogues and Mudboats is setting up an acceptance sampling plan for the special air cleaners he manufactures for his boats.His specifications,and the resulting plan,are shown on the POM for Windows output below.In relatively plain English (someone else will translate for Pierre),explain exactly what he will do when performing the acceptance sampling procedure,and what actions he might take based on the results.

Accepted Answer

Pierre should select samples of size 175

Question 18

The purpose of process control is to detect when natural causes of variation are present.

Accepted Answer

A) True 
 B)False

Question 19

Define consumer's risk.Is it a Type I or Type II error? What is the symbol for its value?

Accepted Answer

The consumer's risk is the pro

Question 20

Acceptance sampling accepts or rejects an entire lot based on the information contained in the sample.

Accepted Answer

A) True 
 B)False

Exam 19: Statistical Process Control

Which of the following is TRUE regarding the average outgoing quality level?

The causes of variation in statistical process control are:

For a 3-sigma x-bar chart where the process standard deviation is known,the upper control limit:

A lot that is accepted by acceptance sampling is certified to be free of defects.

The x-bar chart,like the c-chart,is based on the exponential distribution.

Under which of the following situations will the average outgoing quality (AOQ)decrease?

Acceptance sampling:

Consumer's risk is the probability of:

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

What is the difference between the process capability ratio Cp and the process capability index Cpk?

A Cpk index greater than ________ is a capable process,one that generates fewer than 2.7 defects per 1000 at the ±3σ level.

An x-bar control chart was examined and no data points fell outside of the limits.Can this process be considered in control?

Which of the following is true regarding the relationship between AOQ and the true population percent defective?

A normal distribution is generally described by its two parameters: the mean and the range.

The purpose of process control is to detect when natural causes of variation are present.

Define consumer's risk.Is it a Type I or Type II error? What is the symbol for its value?

Acceptance sampling accepts or rejects an entire lot based on the information contained in the sample.

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