Question 1

In most acceptance sampling plans,when a lot is rejected,the entire lot is inspected and all defective items are replaced.When using this technique the AOQ

Accepted Answer

A) worsens (AOQ becomes a larger fraction). 
B) improves (AOQ becomes a smaller fraction). 
C) is not affected,but the AQL is improved. 
D) is not affected. 
E) falls to zero. 
A) worsens (AOQ becomes a larger fraction). 
B) improves (AOQ becomes a smaller fraction). 
C) is not affected,but the AQL is improved. 
D) is not affected. 
E) falls to zero.

Question 2

A bank's manager has videotaped 20 different teller transactions to observe the number of mistakes being made.Ten transactions had no mistakes,five had one mistake and five had two mistakes.Compute proper control limits at the 90% confidence level.

Accepted Answer

A c-chart should be used,and f

Question 3

Repeated sampling of a certain process shows the average of all sample ranges to be 1.0 cm.The sample size has been constant at n = 5.What are the 3-sigma control limits for this R-chart?

Accepted Answer

The answer of Repeated sampling of a certain process shows...

Question 4

Control charts for variables are based on data that come from

Accepted Answer

A) acceptance sampling. 
B) individual items. 
C) averages of small samples. 
D) averages of large samples. 
E) the entire lot. 
A) acceptance sampling. 
B) individual items. 
C) averages of small samples. 
D) averages of large samples. 
E) the entire lot.

Question 5

Examine the Statistical Process Control outputs below.Answer the following questions.
a.What is the sample size?
b.What is the number of samples?
c.What is the mean of sample 8;what is the range of sample 10?
d.Is this process in control? Explain-a simple Yes or No is insufficient.
e.What additional steps should the quality assurance team take?

Accepted Answer

The sample size is 4;ten samples were ta

Question 6

The normal application of a p-chart is in

Accepted Answer

A) process sampling by variables. 
B) acceptance sampling by variables. 
C) process sampling by attributes. 
D) acceptance sampling by attributes. 
E) rejection sampling by attributes. 
A) process sampling by variables. 
B) acceptance sampling by variables. 
C) process sampling by attributes. 
D) acceptance sampling by attributes. 
E) rejection sampling by attributes.

Question 7

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

Accepted Answer

The Cp ratio does not consider

Question 8

Briefly explain what the Central Limit Theorem has to do with control charts.

Accepted Answer

The CLT underlies the distribu

Question 9

The Central Limit Theorem

Accepted Answer

A) is the theoretical foundation of the c-chart. 
B) states that the average of assignable variations is zero. 
C) allows managers to use the normal distribution as the basis for building some control charts. 
D) states that the average range can be used as a proxy for the standard deviation. 
E) controls the steepness of an operating characteristic curve. 
A) is the theoretical foundation of the c-chart. 
B) states that the average of assignable variations is zero. 
C) allows managers to use the normal distribution as the basis for building some control charts. 
D) states that the average range can be used as a proxy for the standard deviation. 
E) controls the steepness of an operating characteristic curve.

Question 10

For an x-bar chart where the standard deviation is known,the Upper Control Limit

Accepted Answer

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

Question 11

Mistakes stemming from workers' inadequate training represent an assignable cause of variation.

Accepted Answer

A) True 
 B)False

Question 12

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.What are the upper and lower specification limits for this product? The process is currently operating at a mean thickness of 2.50 mm.(a)What is the Cp for this process? (b)About what percent of all units of this liner will meet specifications? Does this meet the technical definition of Six Sigma?

Accepted Answer

(a)LSL = 2.48 mm. ,USL = 2.52 mm. @#IMG-DLM& = (2.

Question 13

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) No,there could be a pattern to the points,the R-chart must be checked. 
B) Yes,it is unlikely that there is a pattern in these points. 
C) No,the number of samples must be known. 
D) Yes. 
E) Yes,there is not enough data to determine otherwise. 
A) No,there could be a pattern to the points,the R-chart must be checked. 
B) Yes,it is unlikely that there is a pattern in these points. 
C) No,the number of samples must be known. 
D) Yes. 
E) Yes,there is not enough data to determine otherwise.

Question 14

If a process has only natural variations,________ % of the time the sample averages will fall inside the (or)control limits.

Accepted Answer

The answer of If a process has only natural variations,________...

Question 15

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

Accepted Answer

A) True 
 B)False

Question 16

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 17

An operator trainee is attempting to monitor a filling process that has an overall average of 705 cc.The average range is 17 cc.If you use a sample size of 6,what are the upper and lower control limits for the x-bar and R chart?

Accepted Answer

From table, @#IMG-DLM& = 0.483, @#IMG-DLM& = 2.004

Question 18

At your first job out of college you have been assigned to the production of bottled 20 oz.soda.
The process has upper and lower limits of 20.5 and 19.5 oz,respectively,with a mean of 19.8 oz
and standard deviation of .3 oz.Your manager has requested the process produce no more than 3.4
defects per 1 million bottles produced.Calculate   and then determine if the process is capable
or if you should be looking for assignable variation.

Accepted Answer

@#IMG-DLM& = minimum ( (20.5 - 19.8)/(3∗.3), (19.8

Question 19

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

Accepted Answer

Range charts and mean charts perform dif

Question 20

Which of the following statements about acceptance sampling is true?

Accepted Answer

A) The steeper an OC curve,the better it discriminates between good and bad lots. 
B) Acceptance sampling removes all defective items. 
C) Acceptance sampling of incoming lots is replacing statistical process control at the supplier. 
D) Acceptance sampling occurs continuously along the assembly line. 
E) The more gradual an OC curve,the better it discriminates between good and bad lots. 
A) The steeper an OC curve,the better it discriminates between good and bad lots. 
B) Acceptance sampling removes all defective items. 
C) Acceptance sampling of incoming lots is replacing statistical process control at the supplier. 
D) Acceptance sampling occurs continuously along the assembly line. 
E) The more gradual an OC curve,the better it discriminates between good and bad lots.

Exam 18: Statistical Process Control

In most acceptance sampling plans,when a lot is rejected,the entire lot is inspected and all defective items are replaced.When using this technique the AOQ

A bank's manager has videotaped 20 different teller transactions to observe the number of mistakes being made.Ten transactions had no mistakes,five had one mistake and five had two mistakes.Compute proper control limits at the 90% confidence level.

Repeated sampling of a certain process shows the average of all sample ranges to be 1.0 cm.The sample size has been constant at n = 5.What are the 3-sigma control limits for this R-chart?

Control charts for variables are based on data that come from

The normal application of a p-chart is in

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

Briefly explain what the Central Limit Theorem has to do with control charts.

The Central Limit Theorem

For an x-bar chart where the standard deviation is known,the Upper Control Limit

Mistakes stemming from workers' inadequate training represent an assignable cause of variation.

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

If a process has only natural variations,________ % of the time the sample averages will fall inside the (or)control limits.

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

An operator trainee is attempting to monitor a filling process that has an overall average of 705 cc.The average range is 17 cc.If you use a sample size of 6,what are the upper and lower control limits for the x-bar and R chart?

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

Which of the following statements about acceptance sampling is true?

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