Question 1

To set   -chart upper and lower control limits,one must know the process central line,which is the

Accepted Answer

A) average of the sample means. 
B) total number of defects in the population. 
C) percent defects in the population. 
D) size of the population. 
E) average range. 
A) average of the sample means. 
B) total number of defects in the population. 
C) percent defects in the population. 
D) size of the population. 
E) average range.

Question 2

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

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) ± 1 standard deviations for means and ± 2 standard deviations for ranges. 
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) ± 1 standard deviations for means and ± 2 standard deviations for ranges.

Question 3

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

Accepted Answer

A) True 
 B)False

Question 4

Larry's boat shop wants to monitor the number of blemishes in the paint of each boat.Construct a 3-sigma c-chart to determine if their paint process is in control using the following data.

Accepted Answer

@#IMG-DLM& @#IMG-DLM& The proc

Question 5

If the process average is in control,then the process range must also be in control.

Accepted Answer

A) True 
 B)False

Question 6

If a sample of items is taken and the mean of the sample is outside the control limits the process is

Accepted Answer

A) out of control and the cause should be established. 
B) in control,but not capable of producing within the established control limits. 
C) within the established control limits with only natural causes of variation. 
D) monitored closely to see if the next sample mean will also fall outside the control limits. 
E) producing high quality products. 
A) out of control and the cause should be established. 
B) in control,but not capable of producing within the established control limits. 
C) within the established control limits with only natural causes of variation. 
D) monitored closely to see if the next sample mean will also fall outside the control limits. 
E) producing high quality products.

Question 7

The ________ is a quality control chart used to control the number of defects per unit of output.

Accepted Answer

The answer of The ________ is a quality control chart...

Question 8

What four elements determine the value of average outgoing quality? Why does this curve rise,peak,and fall?

Accepted Answer

The four elements are the true percent d

Question 9

The c-chart signals whether there has been a

Accepted Answer

A) gain or loss in uniformity. 
B) change in the number of defects per unit. 
C) change in the central tendency of the process output. 
D) change in the percent defective in a sample. 
E) change in the AOQ. 
A) gain or loss in uniformity. 
B) change in the number of defects per unit. 
C) change in the central tendency of the process output. 
D) change in the percent defective in a sample. 
E) change in the AOQ.

Question 10

A process range chart illustrates the amount of variation within the samples.

Accepted Answer

A) True 
 B)False

Question 11

A department chair wants to monitor the percentage of failing students in classes in her department.Each class had an enrollment of 50 students last spring.The number of failing students in the 10 classes offered that term were 1,4,2,0,0,0,0,0,0,and 3,respectively.Compute the control limits for a p-chart at the 95% confidence level.Is the process in control?

Accepted Answer

From Table S6.2 in the text,the z-value

Question 12

Why doesn't acceptance sampling remove all defects from a batch?

Accepted Answer

Acceptance sampling is a method of measu

Question 13

The upper and lower limits for diving ring diameters made by John's Swimming are 40 and 39 cm.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 14

Some degree of variability is present in almost all processes.

Accepted Answer

A) True 
 B)False

Question 15

Producer'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) overlooking defects. 
A) accepting a good lot. 
B) rejecting a good lot. 
C) rejecting a bad lot. 
D) accepting a bad lot. 
E) overlooking defects.

Question 16

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 sample size. 
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 sample size.

Question 17

What is acceptance sampling?

Accepted Answer

Acceptance sampling is a metho

Question 18

If μ = 9 ounces,σ = 0.5 ounces,and n = 9,calculate the 3-sigma control limits.

Accepted Answer

The answer of If μ = 9 ounces,σ = 0.5...

Question 19

The local newspaper receives several complaints per day about typographic errors.Over a seven-day period,the publisher has received calls from readers reporting the following number of errors: 4,3,2,6,7,3,and 9.Based on these data alone,what type of control chart(s)should the publisher use?

Accepted Answer

A) p-chart 
B) c-chart 
C)    -chart 
D) R-chart 
E)    - and R-charts 
A) p-chart 
B) c-chart 
C)    -chart 
D) R-chart 
E)    - and R-charts

Question 20

Cartons of Plaster of Paris are supposed to weigh exactly 32 oz.Inspectors want to develop process control charts.They take ten samples of six boxes each and weigh them.Based on the following data,compute the lower and upper control limits and determine whether the process is in control.

Accepted Answer

n = 6;overall mean = 34.23; @#IMG-DLM& = 0.52.
 @#IMG-DLM& @#IMG-DLM&

Exam 18: Statistical Process Control

To set -chart upper and lower control limits,one must know the process central line,which is the

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

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

Larry's boat shop wants to monitor the number of blemishes in the paint of each boat.Construct a 3-sigma c-chart to determine if their paint process is in control using the following data.

If the process average is in control,then the process range must also be in control.

If a sample of items is taken and the mean of the sample is outside the control limits the process is

The ________ is a quality control chart used to control the number of defects per unit of output.

What four elements determine the value of average outgoing quality? Why does this curve rise,peak,and fall?

The c-chart signals whether there has been a

A process range chart illustrates the amount of variation within the samples.

Why doesn't acceptance sampling remove all defects from a batch?

The upper and lower limits for diving ring diameters made by John's Swimming are 40 and 39 cm.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?

Some degree of variability is present in almost all processes.

Producer's risk is the probability of

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

What is acceptance sampling?

If μ = 9 ounces,σ = 0.5 ounces,and n = 9,calculate the 3-sigma control limits.

The local newspaper receives several complaints per day about typographic errors.Over a seven-day period,the publisher has received calls from readers reporting the following number of errors: 4,3,2,6,7,3,and 9.Based on these data alone,what type of control chart(s)should the publisher use?

Cartons of Plaster of Paris are supposed to weigh exactly 32 oz.Inspectors want to develop process control charts.They take ten samples of six boxes each and weigh them.Based on the following data,compute the lower and upper control limits and determine whether the process is in control.

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