Question 1

To obtain a 99.7 percent confidence level in a p-chart, we would use a value of 3 for "z".

Accepted Answer

A) True 
 B)False  True

Question 2

Consider a sampling plan with n=40 and c=1 and given Acceptable quality level (AQL), Lot tolerance percent defective (LTPD), producer's risk (α) and consumer's risk (β).Suppose that c is increased to 2, keeping AQL and LTPD unchanged, consumer's risk (β) will

Accepted Answer

A) Always decrease 
B) Always increase 
C) Sometime decrease 
D) Stay the same. 
E) None of the above. 
A) Always decrease 
B) Always increase 
C) Sometime decrease 
D) Stay the same. 
E) None of the above. B

Question 3

For which of the following should we use an R-chart to monitor process quality?

Accepted Answer

A) Grades in a freshman "pass/fail" course 
B) Tire pressures in an auto assembly plant 
C) Vehicles passing emissions inspection 
D) Computer software errors 
E) Number of units with missing operations 
A) Grades in a freshman "pass/fail" course 
B) Tire pressures in an auto assembly plant 
C) Vehicles passing emissions inspection 
D) Computer software errors 
E) Number of units with missing operations B

Question 4

Variation that is inherent in a production process itself is called assignable variation.

Accepted Answer

A) True 
 B)False

Question 5

You want to determine the upper control line for a p-chart for quality control purposes.You take several samples of a size of 100 items in your production process.From the samples, you determine the fraction defective is 0.05 and the standard deviation is 0.01.If the desired confidence level is 99.7 percent, which of the following is the resulting UCL value for the line?

Accepted Answer

A) 0.39 
B) 0.08 
C) 0.06 
D) 0.05 
E) None of these 
A) 0.39 
B) 0.08 
C) 0.06 
D) 0.05 
E) None of these

Question 6

For which of the following should we use a p-chart to monitor process quality?

Accepted Answer

A) Defective electrical switches 
B) Errors in the length of a pencil 
C) Weight errors in cans of soup 
D) Temperature of entrees in a restaurant 
E) Letter grades on a final examination 
A) Defective electrical switches 
B) Errors in the length of a pencil 
C) Weight errors in cans of soup 
D) Temperature of entrees in a restaurant 
E) Letter grades on a final examination

Question 7

One hundred percent inspection is justified when the cost of inspection is low.

Accepted Answer

A) True 
 B)False

Question 8

Quality control charts usually have a central line and upper and lower control limit lines.Which of the following is a reason that the process being monitored with the chart should be investigated?

Accepted Answer

A) A single plot falls above or below the control limits. 
B) Behavior is normal. 
C) A large number of plots are on or near the central line. 
D) There is no real trend in any direction. 
E) There is a change in raw materials or operators. 
A) A single plot falls above or below the control limits. 
B) Behavior is normal. 
C) A large number of plots are on or near the central line. 
D) There is no real trend in any direction. 
E) There is a change in raw materials or operators.

Question 9

The probability associated with rejecting a high-quality lot is denoted in acceptance sampling with the Greek letter alpha.

Accepted Answer

A) True 
 B)False

Question 10

Genichi Taguchi's view of the cost of quality is that variance is a discontinuous function.

Accepted Answer

A) True 
 B)False

Question 11

Process control is concerned with monitoring quality after the product or service has been produced.

Accepted Answer

A) True 
 B)False

Question 12

Variation in production systems that is caused by factors that can be clearly identified and possibly even managed is called assignable variation.

Accepted Answer

A) True 
 B)False

Question 13

An example of assignable variation in a production system may be that workers are not identically trained.

Accepted Answer

A) True 
 B)False

Question 14

A p-chart has upper and lower control limits expressed as lines on the chart.As long as the sample values fall between these two lines, there is no need to investigate process behavior.

Accepted Answer

A) True 
 B)False

Question 15

If there are 400 total defects from 8 samples, each sample consisting of 20 individual items in a production process, which of the following is the fraction defective that can be used in a p-chart for quality control purposes?

Accepted Answer

A) 400 
B) 160 
C) 2.5 
D) 1.0 
E) 0.4 
A) 400 
B) 160 
C) 2.5 
D) 1.0 
E) 0.4

Question 16

You want to develop a three-sigma R-chart.You know the average range is 12 based on several samples of size 6.Which of the following is the resulting LCL?

Accepted Answer

A) 20.0 
B) 18.3 
C) 7.02 
D) 5.6 
E) 0.0 
A) 20.0 
B) 18.3 
C) 7.02 
D) 5.6 
E) 0.0

Question 17

Statistical process control involves testing random samples of output from a process to determine whether the process is producing items within a preselected range.

Accepted Answer

A) True 
 B)False

Question 18

For which of the following should we use a p-chart to monitor process quality?

Accepted Answer

A) The dimensions of brick entering a kiln 
B) Lengths of boards cut in a mill 
C) The weight of fluid in a container 
D) Grades in a freshman "pass/fail" course 
E) Temperatures in a classroom 
A) The dimensions of brick entering a kiln 
B) Lengths of boards cut in a mill 
C) The weight of fluid in a container 
D) Grades in a freshman "pass/fail" course 
E) Temperatures in a classroom

Question 19

You have just used the capability index (Cpk) formulas to compute the two values "min [1, 1]." Which of the following is the proper interpretation of these numbers?

Accepted Answer

A) The true capability index value is exactly 1. 
B) The mean of the production process has shifted to the left of the design limits. 
C) The mean of the production process has shifted to the right of the design limits. 
D) The mean has not shifted at all. 
E) None of these 
A) The true capability index value is exactly 1. 
B) The mean of the production process has shifted to the left of the design limits. 
C) The mean of the production process has shifted to the right of the design limits. 
D) The mean has not shifted at all. 
E) None of these

Question 20

You want to develop a three-sigma R-chart.You know the average range is 5 based on several samples of size 10.Which of the following is the resulting UCL?

Accepted Answer

A) 20.9 
B) 8.9 
C) 7.02 
D) 5 
E) 3.1 
A) 20.9 
B) 8.9 
C) 7.02 
D) 5 
E) 3.1

Exam 13: Statistical Quality Control

To obtain a 99.7 percent confidence level in a p-chart, we would use a value of 3 for "z".

Consider a sampling plan with n=40 and c=1 and given Acceptable quality level (AQL), Lot tolerance percent defective (LTPD), producer's risk (α) and consumer's risk (β).Suppose that c is increased to 2, keeping AQL and LTPD unchanged, consumer's risk (β) will

For which of the following should we use an R-chart to monitor process quality?

Variation that is inherent in a production process itself is called assignable variation.

For which of the following should we use a p-chart to monitor process quality?

One hundred percent inspection is justified when the cost of inspection is low.

Quality control charts usually have a central line and upper and lower control limit lines.Which of the following is a reason that the process being monitored with the chart should be investigated?

The probability associated with rejecting a high-quality lot is denoted in acceptance sampling with the Greek letter alpha.

Genichi Taguchi's view of the cost of quality is that variance is a discontinuous function.

Process control is concerned with monitoring quality after the product or service has been produced.

Variation in production systems that is caused by factors that can be clearly identified and possibly even managed is called assignable variation.

An example of assignable variation in a production system may be that workers are not identically trained.

A p-chart has upper and lower control limits expressed as lines on the chart.As long as the sample values fall between these two lines, there is no need to investigate process behavior.

If there are 400 total defects from 8 samples, each sample consisting of 20 individual items in a production process, which of the following is the fraction defective that can be used in a p-chart for quality control purposes?

You want to develop a three-sigma R-chart.You know the average range is 12 based on several samples of size 6.Which of the following is the resulting LCL?

Statistical process control involves testing random samples of output from a process to determine whether the process is producing items within a preselected range.

For which of the following should we use a p-chart to monitor process quality?

You have just used the capability index (Cpk) formulas to compute the two values "min [1, 1]." Which of the following is the proper interpretation of these numbers?

You want to develop a three-sigma R-chart.You know the average range is 5 based on several samples of size 10.Which of the following is the resulting UCL?

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