Question 1

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

Accepted Answer

A) True 
 B)False  True

Question 2

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. D

Question 3

McDaniel Shipyards wants to develop a control chart to assess the quality of its steel plate.They take ten sheets of 1" steel plate and compute the number of cosmetic flaws on each roll.Each sheet is 20' by 100'.Based on the following data,develop limits for the 3-sigma control chart,plot the control chart,and determine whether the process is in control.

Accepted Answer

Sample six is above the control limits; therefore,the process is out of control.

Question 4

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 5

The steeper an OC curve,the better it discriminates between good and bad lots.

Accepted Answer

A) True 
 B)False

Question 6

Acceptance sampling's primary purpose is to:

Accepted Answer

A) estimate process quality. 
B) identify processes that are out of control. 
C) detect and eliminate defectives. 
D) decide if a lot meets predetermined standards. 
E) determine whether defective items found in sampling should be replaced. 
A) estimate process quality. 
B) identify processes that are out of control. 
C) detect and eliminate defectives. 
D) decide if a lot meets predetermined standards. 
E) determine whether defective items found in sampling should be replaced.

Question 7

Natural variations:

Accepted Answer

A) are variations that are to be identified and investigated. 
B) are variations that can be traced to a specific cause. 
C) are the same as assignable variations. 
D) lead to occasional false findings that processes are out of control. 
E) play no role in statistical process control. 
A) are variations that are to be identified and investigated. 
B) are variations that can be traced to a specific cause. 
C) are the same as assignable variations. 
D) lead to occasional false findings that processes are out of control. 
E) play no role in statistical process control.

Question 8

________ is variation in a production process that can be traced to specific causes.

Accepted Answer

Assignable

Question 9

When a lot has been accepted by acceptance sampling,we know that:

Accepted Answer

A) it has more defects than existed before the sampling. 
B) it has had all its defects removed by 100% inspection. 
C) it will have the same defect percentage as the LTPD. 
D) it has no defects present. 
E) All of the above are false. 
A) it has more defects than existed before the sampling. 
B) it has had all its defects removed by 100% inspection. 
C) it will have the same defect percentage as the LTPD. 
D) it has no defects present. 
E) All of the above are false.

Question 10

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 11

The specification for a plastic handle calls for a length of 6.0 inches ± .2 inches.The standard deviation of the process is estimated to be 0.05 inches.What are the upper and lower specification limits for this product? The process is known to operate at a mean thickness of 6.1 inches.What are the Cp and Cpk values for this process? Is this process capable of producing the desired part?

Accepted Answer

LSL = 5.8 inches,USL = 6.2 inches.Cp is

Question 12

What four elements determine the value of average outgoing quality?

Accepted Answer

The four elements are the true percentag

Question 13

The usual purpose of an R-chart is to signal whether there has been a:

Accepted Answer

A) gain or loss in dispersion. 
B) change in the percent defective in a sample. 
C) change in the central tendency of the process output. 
D) change in the number of defects in a sample. 
E) change in the consumer's risk. 
A) gain or loss in dispersion. 
B) change in the percent defective in a sample. 
C) change in the central tendency of the process output. 
D) change in the number of defects in a sample. 
E) change in the consumer's risk.

Question 14

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 15

What is acceptance sampling?

Accepted Answer

Acceptance sampling is a metho

Question 16

Red Top Cab Company receives multiple complaints per day about driver behavior.Over 9 days the owner recorded the number of calls to be 3,0,8,9,6,7,4,9,and 8.What is the upper control limit for the 3-sigma c-chart?

Accepted Answer

A) 13.35 
B) 8.45 
C) 24.00 
D) 0.00 
E) 9.03 
A) 13.35 
B) 8.45 
C) 24.00 
D) 0.00 
E) 9.03

Question 17

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 18

Assignable variation:

Accepted Answer

A) is a sign that a process is under control. 
B) is to be identified and investigated. 
C) is the same as random variation. 
D) is variation that cannot be traced to a specific cause. 
E) leads to a steep OC curve. 
A) is a sign that a process is under control. 
B) is to be identified and investigated. 
C) is the same as random variation. 
D) is variation that cannot be traced to a specific cause. 
E) leads to a steep OC curve.

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

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.

Exam 20: Statistical Process Control

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

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

An operating characteristic (OC)curve describes:

The steeper an OC curve,the better it discriminates between good and bad lots.

Acceptance sampling's primary purpose is to:

Natural variations:

________ is variation in a production process that can be traced to specific causes.

When a lot has been accepted by acceptance sampling,we know that:

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?

What four elements determine the value of average outgoing quality?

The usual purpose of an R-chart is to signal whether there has been a:

Acceptance sampling:

What is acceptance sampling?

Red Top Cab Company receives multiple complaints per day about driver behavior.Over 9 days the owner recorded the number of calls to be 3,0,8,9,6,7,4,9,and 8.What is the upper control limit for the 3-sigma c-chart?

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

Assignable variation:

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

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?

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