Question 1

Indications in a control chart of an out-of-control situation include all of the following except
A)Six or seven consecutive points that increase or decrease in value
B)About the same number of points above and below the center line
C)There are points outside control limits
D)There are no more points near the center line than there are close to the control limits

Accepted Answer

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Question 2

The upper and lower specification limits for a component are 4.20 and 4.30 ounces, respectively. The process standard deviation is .02, and the process average is 4.24 ounces. Which one of the following statements is true? A)The C_p index indicates the process is centered. B)The C_p index indicates the process is not centered. C)The C_pk index indicates the process is centered. D)The C_pk index indicates the process is not centered.

Accepted Answer

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Question 3

c-charts
A)Are used for the fraction of non-conforming items
B)Count the number of nonconformances per unit
C)Use continuous metrics
D)Can have negative lower limits

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A)Are used for the fraction of non-conforming...

Question 4

The center line (p-bar) for a p-chart is 0.50 with an UCL = 0.70 and a LCL = 0.35. The results of the next eight sample means are 0.45, 0.60, 0.39, 0.44, 0.48, 0.53, 0.54, and 0.61. What would you do?
A)Nothing; the process is in control.
B)increase the sample size to get a better measure.
C)investigate assignable causes because four observations are above the center line.
D)investigate assignable causes because there is a bad trend (run).

Accepted Answer

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Question 5

Define "quality at the source."

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Question 6

To monitor the fraction of printed circuit boards that do not pass a functional test, a(n) ____ is used.
A)  -chart
B)p-chart
C)c-chart
D)R-chart

Accepted Answer

A p-chart (proportion chart) is used to monitor the fraction of nonconforming units in a sample of constant size. In this case, the fraction of printed circuit boards that do not pass a functional test can be monitored using a p-chart. The other charts listed are not applicable for this specific type of monitoring.

Question 7

Statistical calculations will show that if p = .01, then the sample size needed to have at least a 95% chance of finding at least one nonconformance is
A)30
B)100
C)300
D)1,000

Accepted Answer

The formula to calculate the sample size needed for a certain probability of finding at least one nonconformance is:
n = ln(1 - p) / ln(1 - (c/N))
where:
p = probability of nonconformance
c = acceptable number of nonconformances
N = population size
ln = natural logarithm

Plugging in the values given,
p = 0.01
c = 1 (at least one nonconformance)
N = unknown

Solving for N using a sample size of 300 (which is the closest option to the answer) gives a probability of finding at least one nonconformance of 0.951, which is greater than the required 95% chance. Therefore, C is the best choice.

Question 8

Which one of the following statements is true?
A)Common cause variation arises from external sources that are not inherent in the process and is where statistical quality control methods are most useful.
B)If the metric is discrete, a p- or c-chart is normally used.
C)Statistical process control is not used in hospitals due to the high liability costs.
D)Statistical process control charts are used when trying to monitor and control 5- and 6-sigma quality levels.

Accepted Answer

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Question 9

A supplier is producing a machined part for the transmission of your vehicle. The upper specification limit is 0.125 cm and the lower specification limit is 0.085. The process standard deviation for the process that makes this part is 0.008 and the process average is 0.105. What conclusion can be drawn from these process capability data?
A)The process is centered and capable.
B)The process is not centered and capable.
C)The process is centered and not capable.
D)The process is not centered and not capable.

Accepted Answer

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Question 10

p-charts
A)Are used for the fraction of non-conforming items
B)Count the number of nonconformances per unit
C)Use continuous metrics
D)Can have negative lower limits

Accepted Answer

p-charts are used to track the proportion or fraction of non-conforming items in a sample or a process. They are based on discrete data and are helpful in monitoring the stability of a process over time. The p-chart’s limits can be calculated based on the binomial distribution, and the lower control limit cannot be negative.

Question 11

A bottling process sometimes results in overfills or underfills. Overfills are especially damaging to the equipment. Which process capability index would this company most want to monitor? A)C_p B)C_pl C)C_pu D)C_pk

Accepted Answer

The process capability index that measures the capability of a process for non-conforming units only is called Cpu, which is represented by C_pu. Since overfills and underfills are non-conformities, Cpu would be the most relevant index to monitor.

Question 12

Which of the following is not related to a continuous metric?
A)Measured as the degree of conformance to a specification
B)x-bar and R-charts
C)p-chart
D)Time

Accepted Answer

A continuous metric is a measurement that can take on any value within a specific range, whereas a p-chart is used for discrete data such as the proportion of defects in a sample. Measuring conformance to a specification, x-bar and R-charts, and time are all examples of continuous metrics.

Question 13

Honda wants to monitor the number of blemishes (scratches, blisters, etc.) on the fenders of its cars using a statistical process control chart. The most appropriate type of SPC chart is A)x-bar. B)R-bar chart. C)C_pk chart D)c-chart

Accepted Answer

The c-chart is used specifically for counting the number of defects or blemishes in a sample. The other charts listed (x-bar, R-bar, C_pk) are used for continuous data and would not be appropriate for counting discrete defects.

Question 14

Ritz-Carlton Hotel Company uses which one of the following methods to control quality?
A)R-bar and x-bar control charts to monitor customer complaints.
B)The 1:10:100 rule for goods quality only
C)Self-control of the individual employee based on their spontaneous behavior.
D)The process capability index for all goods and services provided by the hotel.

Accepted Answer

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Question 15

Explain and give the significance of the 1:10:100 Rule.

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Question 16

Which of the following suggests a process that is not in control?
A)Points follow a smooth pattern from the lower control limit to the upper control limit
B)The number of points above and below the center line is about the same
C)Points fall randomly above and below the center line
D)No points are outside the control limits

Accepted Answer

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Question 17

If one was monitoring the average time to load a web page, the chart to use would be the
A)  -chart
B)R-chart
C)p-chart
D)c-chart

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Question 18

Define and give an example of the three components of any control system.

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Question 19

Historically, the average proportion of defective bars has been 0.015. Samples of 100 bars each are taken. Construct a p-chart using z = 3. Suppose a sample had 0.044 defectives. What would you do?
A)Nothing; it appears to be random variation.
B)Look for assignable causes.
C)Delete the sample with 0.044 defects and take another sample that is better.
D)None of these choices

Accepted Answer

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Question 20

Which is not related to a discrete metric?
A)Counting
B)Visual inspection
C)Good or bad
D)Time

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Quiz 16: Quality Control and Spc

Indications in a control chart of an out-of-control situation include all of the following except

The upper and lower specification limits for a component are 4.20 and 4.30 ounces, respectively. The process standard deviation is .02, and the process average is 4.24 ounces. Which one of the following statements is true?

c-charts

The center line (p-bar) for a p-chart is 0.50 with an UCL = 0.70 and a LCL = 0.35. The results of the next eight sample means are 0.45, 0.60, 0.39, 0.44, 0.48, 0.53, 0.54, and 0.61. What would you do?

Define "quality at the source."

To monitor the fraction of printed circuit boards that do not pass a functional test, a(n) ____ is used.

Statistical calculations will show that if p = .01, then the sample size needed to have at least a 95% chance of finding at least one nonconformance is

Which one of the following statements is true?

p-charts

A bottling process sometimes results in overfills or underfills. Overfills are especially damaging to the equipment. Which process capability index would this company most want to monitor?

Which of the following is not related to a continuous metric?

Honda wants to monitor the number of blemishes (scratches, blisters, etc.) on the fenders of its cars using a statistical process control chart. The most appropriate type of SPC chart is

Ritz-Carlton Hotel Company uses which one of the following methods to control quality?

Explain and give the significance of the 1:10:100 Rule.

Which of the following suggests a process that is not in control?

If one was monitoring the average time to load a web page, the chart to use would be the

Define and give an example of the three components of any control system.

Historically, the average proportion of defective bars has been 0.015. Samples of 100 bars each are taken. Construct a p-chart using z = 3. Suppose a sample had 0.044 defectives. What would you do?

Which is not related to a discrete metric?