Question 1

If the Cpk index exceeds 1:

Accepted Answer

A) the AQL must be smaller than the LTPD. 
B) σ must be less than one-third of the absolute value of the difference between each specification limit and the process mean. 
C) the x-bar chart must indicate that the process is in control. 
D) the process is capable of Six Sigma quality. 
E) the process is characterized as "not capable." 
A) the AQL must be smaller than the LTPD. 
B) σ must be less than one-third of the absolute value of the difference between each specification limit and the process mean. 
C) the x-bar chart must indicate that the process is in control. 
D) the process is capable of Six Sigma quality. 
E) the process is characterized as "not capable."

Question 2

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 3

The upper and lower limits for diving ring diameters made by John's Swimming Co.are 40 and 39 cm. ,respectively.John took 11 samples with the following average diameters (39,39.1,39.2,39.3,39.4,39.5 39.6,39.7,39.8,39.9,40).Is the process in control?

Accepted Answer

A) Yes,no diameters exceeded the control limits. 
B) No,some diameters exceeded the control limits. 
C) No,there is a distinguishable pattern to the samples. 
D) No,the range is not in control. 
E) There is not enough information to make a decision. 
A) Yes,no diameters exceeded the control limits. 
B) No,some diameters exceeded the control limits. 
C) No,there is a distinguishable pattern to the samples. 
D) No,the range is not in control. 
E) There is not enough information to make a decision.

Question 4

Which of the following is true regarding the process capability index Cpk?

Accepted Answer

A) A Cpk index value of 1 is the highest possible. 
B) The larger the Cpk,the more units meet specifications. 
C) The Cpk index can only be used when the process centerline is also the specification centerline. 
D) Positive values of the Cpk index are good;negative values are bad. 
E) Its value will always be at least as large as the Cp value for the same process. 
A) A Cpk index value of 1 is the highest possible. 
B) The larger the Cpk,the more units meet specifications. 
C) The Cpk index can only be used when the process centerline is also the specification centerline. 
D) Positive values of the Cpk index are good;negative values are bad. 
E) Its value will always be at least as large as the Cp value for the same process.

Question 5

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 6

What is the basic objective of a process control system?

Accepted Answer

It is to provide a s

Question 7

The ________ is the percentage defective in an average lot of goods inspected through acceptance sampling.

Accepted Answer

AOQ or ave

Question 8

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 9

To measure the voltage of batteries,one would sample by attributes.

Accepted Answer

A) True 
 B)False

Question 10

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

Accepted Answer

It provides the theoretical foundation f

Question 11

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 12

A retail store manager is trying to improve and control the rate at which cashiers sign customers up
for store credit cards.The manager takes several samples of size 50.He finds that each sample of 50 contained 5 credit card signups on average.Find p-bar and 99.73% control limits.

Accepted Answer

P-bar = 5/50 = .1 or 10%.Sigma-p = sqrt(

Question 13

According to the text,what is the most common choice of limits for control charts?

Accepted Answer

A) ±1 standard deviation 
B) ±2 standard deviations 
C) ±3 standard deviations 
D) ±3 standard deviations for means and ± 2 standard deviations for ranges 
E) ±6 standard deviations 
A) ±1 standard deviation 
B) ±2 standard deviations 
C) ±3 standard deviations 
D) ±3 standard deviations for means and ± 2 standard deviations for ranges 
E) ±6 standard deviations

Question 14

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)About what percent of all units of this gasket will meet specifications? Does this meet the technical definition of Six Sigma?

Accepted Answer

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

Question 15

A small,independent amusement park collects data on the number of cars with out-of-state license plates.The sample size is fixed at n=25 each day.Data from the previous 10 days indicate the following number of out-of-state license plates:
   (a)Calculate the overall proportion of "tourists" (cars with out-of-state plates)and the standard deviation of proportions.
(b)Using ±3σ limits,calculate the LCL and UCL for these data.
(c)Is the process under control? Explain.

Accepted Answer

(a)p-bar is 56/250 = 0.224;the standard

Question 16

Which of the following statements about acceptance sampling is true?

Accepted Answer

A) Acceptance sampling draws a sample from a population of items,tests the sample,accepts the entire population if the sample is good enough,and rejects it if the sample is poor enough. 
B) The sampling plan contains information about the sample size to be drawn and the critical acceptance or rejection numbers for that sample size. 
C) The steeper an operating characteristic curve,the better its ability to discriminate between good and bad lots. 
D) All of the above are true. 
E) All of the above are false. 
A) Acceptance sampling draws a sample from a population of items,tests the sample,accepts the entire population if the sample is good enough,and rejects it if the sample is poor enough. 
B) The sampling plan contains information about the sample size to be drawn and the critical acceptance or rejection numbers for that sample size. 
C) The steeper an operating characteristic curve,the better its ability to discriminate between good and bad lots. 
D) All of the above are true. 
E) All of the above are false.

Question 17

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 18

Jars of pickles are sampled and weighed.Sample measures are plotted on control charts.The ideal weight should be precisely 11 oz.Which type of chart(s)would you recommend?

Accepted Answer

A) p-chart 
B) c-chart 
C) both an x-bar chart and an R-chart 
D) an x-bar chart,but not an R-chart 
E) both a p-chart and a c-chart 
A) p-chart 
B) c-chart 
C) both an x-bar chart and an R-chart 
D) an x-bar chart,but not an R-chart 
E) both a p-chart and a c-chart

Question 19

Assignable causes:

Accepted Answer

A) are not as important as natural causes. 
B) are within the limits of a control chart. 
C) depend on the inspector assigned to the job. 
D) are also referred to as "chance" causes. 
E) are causes of variation that can be identified and investigated. 
A) are not as important as natural causes. 
B) are within the limits of a control chart. 
C) depend on the inspector assigned to the job. 
D) are also referred to as "chance" causes. 
E) are causes of variation that can be identified and investigated.

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

If the Cpk index exceeds 1:

The upper and lower limits for diving ring diameters made by John's Swimming Co.are 40 and 39 cm. ,respectively.John took 11 samples with the following average diameters (39,39.1,39.2,39.3,39.4,39.5 39.6,39.7,39.8,39.9,40).Is the process in control?

Which of the following is true regarding the process capability index Cpk?

Consumer's risk is the probability of:

What is the basic objective of a process control system?

The ________ is the percentage defective in an average lot of goods inspected through acceptance sampling.

To measure the voltage of batteries,one would sample by attributes.

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

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 retail store manager is trying to improve and control the rate at which cashiers sign customers up for store credit cards.The manager takes several samples of size 50.He finds that each sample of 50 contained 5 credit card signups on average.Find p-bar and 99.73% control limits.

According to the text,what is the most common choice of limits for control charts?

Which of the following statements about acceptance sampling is true?

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

Jars of pickles are sampled and weighed.Sample measures are plotted on control charts.The ideal weight should be precisely 11 oz.Which type of chart(s)would you recommend?

Assignable causes:

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

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