Question 1

A(n)________ is a graph that describes how well an acceptance plan discriminates between good and bad lots.

Accepted Answer

OC or oper

Question 2

The specification for a plastic liner for concrete highway projects calls for a thickness of 6.0 mm ± 0.1 mm.The standard deviation of the process is estimated to be 0.02 mm.What are the upper and lower specification limits for this product? The process is known to operate at a mean thickness of 6.03 mm.What is the Cp and Cpk for this process? About what percent of all units of this liner will meet specifications?

Accepted Answer

LSL = 5.9 mm,USL = 6.1 mm.C_p is (6.1 - 5.

Question 3

Acceptance sampling:

Accepted Answer

A) is the application of statistical techniques to the control of processes. 
B) was developed by Walter Shewhart of Bell Laboratories. 
C) is used to determine whether to accept or reject a lot of material based on the evaluation of a sample. 
D) separates the natural and assignable causes of variation. 
E) is another name for 100% inspection. 
A) is the application of statistical techniques to the control of processes. 
B) was developed by Walter Shewhart of Bell Laboratories. 
C) is used to determine whether to accept or reject a lot of material based on the evaluation of a sample. 
D) separates the natural and assignable causes of variation. 
E) is another name for 100% inspection.

Question 4

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) process capability ratio computations. 
A) process sampling by variables. 
B) acceptance sampling by variables. 
C) process sampling by attributes. 
D) acceptance sampling by attributes. 
E) process capability ratio computations.

Question 5

Which of the following is true of a p-chart?

Accepted Answer

A) The lower control limit is found by subtracting a fraction from the average number of defects. 
B) The lower control limit indicates the minimum acceptable number of defects. 
C) The lower control limit equals D3 times p-bar. 
D) The lower control limit may be at zero. 
E) The lower control limit is the same as the lot tolerance percent defective. 
A) The lower control limit is found by subtracting a fraction from the average number of defects. 
B) The lower control limit indicates the minimum acceptable number of defects. 
C) The lower control limit equals D3 times p-bar. 
D) The lower control limit may be at zero. 
E) The lower control limit is the same as the lot tolerance percent defective.

Question 6

An acceptance sampling plan must define "good lots" and "bad lots" and specify the risk level associated with each one.

Accepted Answer

A) True 
 B)False

Question 7

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 8

The x-bar chart indicates that a gain or loss of uniformity has occurred in dispersion of a production process.

Accepted Answer

A) True 
 B)False

Question 9

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 10

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 11

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

@#IMG-DLM& @#IMG-DLM& Sample six is abov

Question 12

A nationwide parcel delivery service keeps track of the number of late deliveries (more than 30 minutes past the time promised to clients)per day.They plan on using a control chart to plot their results.Which type of control chart(s)would you recommend?

Accepted Answer

A) both x-bar chart and R-chart 
B) p-chart 
C) c-chart 
D) x-bar chart 
E) both p-chart and c-chart 
A) both x-bar chart and R-chart 
B) p-chart 
C) c-chart 
D) x-bar chart 
E) both p-chart and c-chart

Question 13

In statistical process control,the range is often used as a substitute for the standard deviation.

Accepted Answer

A) True 
 B)False

Question 14

The probability of rejecting a good lot is known as consumer's risk.

Accepted Answer

A) True 
 B)False

Question 15

Averages of small samples,not individual measurements,are generally used in statistical process control.

Accepted Answer

A) True 
 B)False

Question 16

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 17

Some degree of variability is present in almost all processes.

Accepted Answer

A) True 
 B)False

Question 18

The Cpk index measures the difference between the desired and actual dimensions of goods or services produced.

Accepted Answer

A) True 
 B)False

Question 19

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 20

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

Accepted Answer

It provides the theoretical foundation f

Exam 19: Statistical Process Control

A(n)________ is a graph that describes how well an acceptance plan discriminates between good and bad lots.

Acceptance sampling:

The normal application of a p-chart is in:

Which of the following is true of a p-chart?

An acceptance sampling plan must define "good lots" and "bad lots" and specify the risk level associated with each one.

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

The x-bar chart indicates that a gain or loss of uniformity has occurred in dispersion of a production process.

Which of the following statements about acceptance sampling is true?

If the Cpk index exceeds 1:

A nationwide parcel delivery service keeps track of the number of late deliveries (more than 30 minutes past the time promised to clients)per day.They plan on using a control chart to plot their results.Which type of control chart(s)would you recommend?

In statistical process control,the range is often used as a substitute for the standard deviation.

The probability of rejecting a good lot is known as consumer's risk.

Averages of small samples,not individual measurements,are generally used in statistical process control.

Some degree of variability is present in almost all processes.

The Cpk index measures the difference between the desired and actual dimensions of goods or services produced.

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

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

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Filters

If the C_pk index exceeds 1:

The C_pk index measures the difference between the desired and actual dimensions of goods or services produced.