Question 1

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

Accepted Answer

The answer of Which is not related to a discrete...

Question 2

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

The answer of A supplier is producing a machined part...

Question 3

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

The answer of Which of the following suggests a process...

Question 4

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

Accepted Answer

The answer of To monitor the fraction of printed circuit...

Question 5

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

The answer of Ritz-Carlton Hotel Company uses which one of...

Question 6

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 type of measurement that can take on any value between two endpoints. Options A, B, and D all involve continuous metrics. Option C, the p-chart, is a type of control chart used for monitoring the proportion of defective items in a process, which is a discrete metric since the proportion can only take on certain values (e.g. 0.25, 0.5, 0.75). Therefore, option C is not related to a continuous metric.

Question 7

Define "quality at the source."

Accepted Answer

The answer of Define "quality at the source."...

Question 8

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 answer of Statistical calculations will show that if p...

Question 9

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

Accepted Answer

The answer of Define and give an example of the...

Question 10

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

Accepted Answer

The A-chart is used to monitor the average time to load a web page.

Question 11

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

The answer of Historically, the average proportion of defective bars...

Question 12

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 involves monitoring underfills and overfills is CPu (or C_pu in long form). This index specifically takes into account the percentage of parts that fall below the lower specification limit (underfills) and uses this data to calculate the capability of the process. In this case, the company would want to ensure that the process is capable of producing parts that do not have excessive overfills or underfills, so monitoring CPu would be the most appropriate choice.

Question 13

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

The answer of Which one of the following statements is...

Question 14

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 variable being measured (number of blemishes, scratches, etc.) is discrete and countable, so the appropriate type of control chart is a c-chart. The other options (x-bar, R-bar, and C_pk chart) are used for continuous data.

Question 15

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

The answer of Indications in a control chart of an...

Question 16

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 specifically designed to monitor the proportion (or fraction) of non-conforming items in a sample or process. The chart calculates the upper and lower control limits and compares them to the fraction of non-conforming items in the sample. Therefore, Option A is the correct choice. Options B and C describe other types of control charts, such as c-charts and X-bar charts, respectively. Option D is not applicable to p-charts as the lower limit cannot be negative.

Question 17

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

The process is not centered because the C_pk index is used for evaluating the process capability when the process average is not at the midpoint of the specification limits.

Question 18

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

Accepted Answer

The answer of Explain and give the significance of the...

Question 19

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

The answer of The center line p-bar) for a p-chart...

Question 20

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

Accepted Answer

The answer of c-charts
A)Are used for the fraction of non-conforming...

Quiz 16: Quality Control and Spc

Which is not related to a discrete metric?

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

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

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

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

Define "quality at the source."

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

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

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

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 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 one of the following statements is true?

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

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

p-charts

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.

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

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?

c-charts