Deck 14: Statistical Process Control

Question 1

Samples which are ordered by time or sequence are called

A)systematic samples.
B)random samples.
C)nonrandom samples.
D)biased samples.

Answer 1

A

Question 2

Every 10th product coming off a production line is inspected to check for quality.Such a sampling technique is called

A)systematic sampling.
B)random sampling.
C)nonrandom sampling.
D)biased sampling.

Answer 2

A

Question 3

The width of a distribution is called the mean.

Answer 3

False

Question 4

Variation that centers on a mean and occurs with a somewhat consistent amount of dispersion is known as random variation.

Question 5

Variation that centers on a mean and occurs with a somewhat consistent amount of dispersion is known as ________ variation.

Question 6

Samples which are ordered by time or sequence are called systematic samples.

Question 7

A manufacturer of snow shovels sees a drop in the demand for snow shovels due to an unseasonally warm winter.This means that the demand experiences

A)random variation.
B)nonrandom variation.
C)seasonal variation.
D)no variation.

Question 8

A process that is stable has no variation present in the process.

Question 9

Data gathered to check if a process is stable is called ________.

Question 10

The cost of inspection for three different product characteristics A,B,and C,is $10,$12 and $8 respectively.The cost of failure if any one of them breaks down is $100 (full replacement cost of the product).What is the inspection ratio for B?

A)0.10
B)0.08
C)0.12
D)0.05

Question 11

The jump in sales of hand sanitizers experienced by the manufacturer of sanitizing products due to a scare of H1N1 virus outbreak is known as ________ variation.

Question 12

Concluding that a process is stable means only ________ variation is present in the process.

Question 13

Variation that results from a specific event,which may be a shift in a process mean or an unexpected occurrence,is known as ________ variation.

Question 14

Variation that results from a specific event,which may be a shift in a process mean or an unexpected occurrence,is known as random variation.

Question 15

Samples gathered in such a way that every piece of product has an equal chance of being selected for inspection are called systematic samples.

Question 16

A quality manager concludes that a process is stable.This means that

A)there is no variation present in the process.
B)there is only random variation present in the process.
C)there is only nonrandom variation present in the process.
D)None of the above

Question 17

The width of a distribution is called the ________.

Question 18

Graphs designed to signal process workers when nonrandom variation occurs in a process are called ________.

Question 19

The cost of inspection for three different product characteristics A,B,and C,is $10,$12 and $8 respectively.The cost of failure if any one of them breaks down is $100 (full replacement cost of the product).Where should the priority to inspect first be?

A)A
B)B
C)C
D)None of the above

Question 20

Samples gathered in such a way that every piece of product has an equal chance of being selected for inspection are called

A)systematic samples.
B)random samples.
C)nonrandom samples.
D)biased samples.

Question 21

The control chart used to count the number nonconforming in a consistent sample space is called the

A)p-chart.
B)R-chart.
C)c-chart.
D)u-chart.

Question 22

Every 10th product coming off a production line is inspected to check for quality.Such a sampling technique is called ________.

Question 23

The ratio between the cost of inspection and the cost of failure resulting from a particular step in the process is called ________.

Question 24

Samples which are ordered by time or sequence are called ________.

Question 25

A bottling plant measures the volume of liquid in the bottle.The control chart which will be used with such a measurement is a

A)p-chart.
B)X-bar chart.
C)c-chart.
D)u-chart.

Question 26

A continuous measurement such as weight,height,or volume is known as

A)attribute.
B)variable.
C)systematic.
D)proportion.

Question 27

Use the information below to answer the following question(s).Use the "Factors for Control Limits" Table A.3 from the textbook where required:
A control chart needs to be developed to determine if the temperature for a process is within control limits.Five samples each having 4 observations are taken and the sample measurements (temperature in degrees F)are noted in the table below:

What is the value of the average range R-bar?

A)3.68
B)8.398
C)3.125
D)5.252

Question 28

A control chart needs to be developed to determine if the proportion of late deliveries of a pizza delivery restaurant is within control limits.The control chart which would be most appropriate to use in this situation would be the

A)p-chart.
B)R-chart.
C)c-chart.
D)u-chart.

Question 29

Use the information below to answer the following question(s).Use the "Factors for Control Limits" Table A.3 from the textbook where required:
A control chart needs to be developed to determine if the temperature for a process is within control limits.Five samples each having 4 observations are taken and the sample measurements (temperature in degrees F)are noted in the table below:

What is the LCL for a X-bar chart?

A)253.218
B)247.852
C)250
D)252.527

Question 30

For process control charts,using control limits corresponding to z = 3 standard deviations from the mean will capture what percentage of the random variation in the process?

A)90%
B)95.6%
C)98.2%
D)99.7%

Question 31

Quality inspection performed during the production process is called ________.

Question 32

A control chart needs to be developed to determine if the temperature for a process is within control limits.The control chart which would be most appropriate to use in this situation would be the

A)p-chart.
B)X-bar chart.
C)c-chart.
D)u-chart.

Question 33

Use the information below to answer the following question(s).Use the "Factors for Control Limits" Table A.3 from the textbook where required:
A control chart needs to be developed to determine if the temperature for a process is within control limits.Five samples each having 4 observations are taken and the sample measurements (temperature in degrees F)are noted in the table below:

What is the UCL for a X-bar chart?

A)253.218
B)247.852
C)250
D)252.527

Question 34

For process control charts,to approximately capture 99% of the random variation,the control limits will need to correspond to how many standard deviations from the mean?

A)z = 1
B)z = 2
C)z = 3
D)z = 4

Question 35

Samples gathered in such a way that every piece of product has an equal chance of being selected for inspection are called ________.

Question 36

A measurement to determine if a defect is either present or not is known as

A)attribute.
B)variable.
C)systematic.
D)proportion.

Question 37

Use the information below to answer the following question(s).Use the "Factors for Control Limits" Table A.3 from the textbook where required:
A control chart needs to be developed to determine if the temperature for a process is within control limits.Five samples each having 4 observations are taken and the sample measurements (temperature in degrees F)are noted in the table below:

What is the value of the grand mean?

A)249.325
B)251.300
C)250.535
D)248.500

Question 38

The control chart used to measure the number of defects per unit is called the

A)p-chart.
B)R-chart.
C)c-chart.
D)u-chart.

Question 39

The control chart used to monitor the dispersion of a process is called the

A)p-chart.
B)R-chart.
C)c-chart.
D)u-chart.

Question 40

The control chart used to measure the proportion defective is called the

A)p-chart.
B)R-chart.
C)c-chart.
D)u-chart.

Question 41

Use the information below to answer the following question(s).Use the "Factors for Control Limits" Table A.3 from the textbook where required:
A control chart needs to be developed to determine if the temperature for a process is within control limits.Five samples each having 4 observations are taken and the sample measurements (temperature in degrees F)are noted in the table below:

What is the LCL for a R chart?

A)3.68
B)8.398
C)3.125
D)0

Question 42

The rule that states that sampling distributions generally are normally distributed is known as the ________.

Question 43

A continuous measurement such as weight,height,or volume is known as an attribute.

Question 44

The control chart used to measure the proportion defective is called the u chart.

Question 45

A measurement to determine if a defect is either present or not is known as a(n)________.

Question 46

The control chart used to monitor the average of the characteristic being measured is called an R-chart.

Question 47

Use the information below to answer the following question(s).
An inspector visually inspects 10 samples of 200 computer monitors each for defects.Using trained judgement,the inspector either accepts or rejects the monitors based on whether they are flawless.The table below gives the results of these inspections from the 10 samples:

What is the LCL for a p chart?

A)0.050
B)0.000
C)0.053
D)0.0091

Question 48

For process control charts,to approximately capture 99% of the random variation,the control limits will correspond to z = 3 standard deviations from the mean.

Question 49

Each point on the control chart represents data from samples that are plotted sequentially over time.

Question 50

The control chart used to count the number nonconforming in a consistent sample space is called the c chart.

Question 51

Use the information below to answer the following question(s).Use the "Factors for Control Limits" Table A.3 from the textbook where required:
A control chart needs to be developed to determine if the temperature for a process is within control limits.Five samples each having 4 observations are taken and the sample measurements (temperature in degrees F)are noted in the table below:

What is the UCL for a R chart?

A)3.68
B)8.398
C)3.125
D)0

Question 52

For process control charts,to approximately capture 99% of the random variation,the control limits will correspond to ________ standard deviations from the mean.

Question 53

For process control charts,using control limits corresponding to z = 3 standard deviations from the mean will capture exactly ________ of random variation.

Question 54

For process control charts,using control limits corresponding to z = 3 standard deviations from the mean will capture exactly 95% of random variation.

Question 55

p control charts are used with variable measurements.

Question 56

A measurement to determine if a defect is either present or not is known as an attribute.

Question 57

A process which is in control is always a capable process.

Question 58

A continuous measurement such as weight,height,or volume is known as a ________.

Question 59

Use the information below to answer the following question(s).
An inspector visually inspects 10 samples of 200 computer monitors each for defects.Using trained judgement,the inspector either accepts or rejects the monitors based on whether they are flawless.The table below gives the results of these inspections from the 10 samples:

What is the UCL for a p chart?

A)0.050
B)0.048
C)0.053
D)0.0091

Question 60

Use the information below to answer the following question(s).
An inspector visually inspects 10 samples of 200 computer monitors each for defects.Using trained judgement,the inspector either accepts or rejects the monitors based on whether they are flawless.The table below gives the results of these inspections from the 10 samples:

What is the average proportion defective?

A)0.022
B)0.025
C)0.018
D)0.027

Question 61

Aspects of the product that will result in either good or poor function of the product are known as ________.

Question 62

The ability of a process to produce a product that meets specification is known as ________.

Question 63

A comparative measure of the extent to which individual products meet specification is known as ________.

Question 64

Fifty sample measurements of the length of an automotive component yield a grand mean of 1.33 inches with an estimated standard deviation of 0.2 inches.The specification length is between 1.2 and 1.4 inches.Is the process capable of meeting the required specifications?

A)Yes
B)No
C)Insufficient information to determine
D)Barely capable

Question 65

The central limit theorem states that sampling distributions generally are ________ distributed.

Question 66

Fifty sample measurements of the length of an automotive component yield a grand mean of 1.33 inches with an estimated standard deviation of 0.2 inches.The specification length is between 1.2 and 1.4 inches.Calculate the process capability index.

A)0.1167
B)0.18
C)0.2167
D)0.2877

Question 67

The control chart used to monitor the average of the characteristic being measured is called a(n)________ chart.

Question 68

Five points in sequence,either above or below the mean are called ________.

Question 69

On a control chart,one data point out above the control limit is considered normal behavior.

Question 70

The control chart used to monitor the dispersion of a process is called a(n)________ chart.

Question 71

On a control chart,how many successive data points on an increasing or decreasing line require an investigation for cause of progressive change?

A)7 or more
B)5 or more
C)4 or more
D)3 or more

Question 72

Seven points in succession,all increasing or decreasing in a process chart are called ________.

Question 73

The control chart used to count the number nonconforming in a consistent sample space is called the ________ chart.

Question 74

The control chart used to measure the proportion defective is called the ________ chart.

Question 75

Adjusting a process when it only exhibits random variation is called ________.

Question 76

A process that exhibits nonrandom variation is a(n)________ process.

Question 77

A process that is out of control exhibits ________ variation.

Question 78

A process capability measure of 1.00 or below indicates that the process is capable.

Question 79

On a control chart,two data points near the UCL requires an investigation for the cause of variation,however two data points near the LCL does not call for any investigation and is part of normal behavior.

Question 80

On a control chart,________ successive data points on an increasing or decreasing line require an investigation for cause of progressive change.