Mod 6 - Ch 10 Flashcards
When the product or service can have more than one defect per unit, which of the following is the most appropriate chart?
C Chart
Which of the following is defined as the difference between the highest and lowest numbers in a sample?
Range
The best way to control quality is by inspection.
False
If the lower control limit for the p chart is a negative value, then which of the following becomes the new value?
0
Which of the following is variation that is caused by factors that can be clearly identified?
Assignable Variation
In which step of the DMAIC cycle would you identify ways to remove the cause of defects and confirm key variables?
Improve
Which type of quality cost deals with scrap, rework and repair?
Internal Failure Costs
What term refers to the inherent value of the product in the marketplace?
Design Quality
You are a manager that has calculated the DPMO to be 10,000. Is this process meeting Six Sigma standards?
No
In the acronym DMAIC, what does the C stand for?
Control
Expenditures related to achieving product or service quality include all of the following except:
Manufacturing Cost
Which quality term refers to the degree to which the product or service design specifications are met?
Conformance
Which analytical tool of Six Sigma breaks down a problem into the relative contributions of its components?
Pareto Charts
What do Six Sigma programs seek to reduce in processes?
Variation
The concept of quality at source indicates that the person who does the work should take responsibilities ensuring conformance quality of his or her output.
True
Red Top Cab Company receives several complaints per day about the behavior of its drivers. You randomly sampled 9 weeks. The overall average number of complaints per week received from irate passengers over the 9 weeks is 6. What would be the LCL and UCL of your quality control chart if your interest is the number of complaints? (Assuming z value of 3 is used to construct UCL and LCL).
0 and 13
UCL = 6+3sqrt(6), LCL = 6-3sqrt(6) –> 0.
For the 9 weeks you randomly selected in the previous problem, the number of days in each week that the owner received complaint(s) is as follows: 2, 0, 1, 1, 4, 2, 0, 3, and 1 (assuming five days a week). What would be the LCL and UCL of the appropriate control chart? (Assuming z value of 3 is used to construct UCL and LCL).
0 and 0.93
Suppose you are interested in the weight of ipad air produced in a manufacturing process. The CL, UCL, and LCL for the X-bar and R charts are as follows:
X-bar chart: CL = 1, UCL = 1.03, and LCL = 0.97
R-chart: CL= 0.05, UCL = 0.08, and LCL = 0.02
A new sample is collected. Assuming the sample size is large enough. The weight for each ipad air in this new sample is: 1.05, 1, 1.01, 0.99, and 0.98. Based on the new sample and the information on the control limits, which of the following conclusion would you be able to make?
No assignable variations have been detected yet and therefore no action should be taken now.
calculate sample mean and sample range of this particular sample. The decision is based upon sample mean and sample range not the individual X value
Plots of sample ranges indicate that the most recent value is below the lower control limit. What course of action would you recommend?
Consistency (or precision) is not in control; investigate for the assignable cause that created this seemingly desirable condition so that the process can be brought under control
Which of the following is not an example of when to use a c-chart?
Inspecting the diameter of holes drilled into a pipe
Diameter is continuous numerical data. Hence variable charts not attribute charts are required here
The quality assurance manager is assessing the capability of a process that puts pressurized grease in an aerosol can. The design specifications call for an upper specification limit of 65 pounds per square inch (psi) and a lower specification limit of 55 psi. The process mean is 61 psi and standard deviation is 2 psi. What is the Cpk value of this process?
0.67
The quality assurance manager is assessing the capability of a process that puts pressurized grease in an aerosol can. The design specifications call for an upper specification limit of 65 pounds per square inch (psi) and a lower specification limit of 55 psi. The process mean is 61 psi and standard deviation is 2 psi. Which of the following statement is NOT true?
Shifting the means of the current process to 60 would decrease the Cpk value
The center of the specification limits is 60. Shifting process means from 61 to 60 (i.e. towards the center) will increase Cpk
A process has a Cpk value less than 0. Which of the following conclusion can be made?
There is more than 50% of chance that this process will produce defective items.
When Cpk is less than 0, it means either the process mean is greater than USL or smaller than LSL. In either case, more than 50% chance products will fall outside the specification limits. Please check slide 56.
Which analytical tool of Six Sigma breaks down a problem into the relative contributions of its components?
Pareto Charts
Which of the following is an example of internal failure cost associated with quality?
Scrap
