Chapter 11: Six Sigma Process
A sample of 25 customer orders is selected. It is found that two orders had errors. In the first of these, two errors were found. In the second, three errors were found. No other errors were encountered. The DPU is _____ .
0.20
There are 40 possible defects that can occur when manufacturing a single part. Suppose a sample of 30 parts is taken. The total number of defects found in the sample is 10. What is the DPMO?
8,333
if 100 pieces are started through a process but only 85 are successfully completed, the First Time Yield is ____________ percent.
85
In a chip manufacturing process, 5,000 chips begin the process. At the end, only 4,500 pass quality control tests. The FTY would be ___ percent.
90 percent
The number of defects per unit sampled is measured by ______ .
DPU
Which of the following represents the likelihood that a process will complete all of the required steps without any failures or rejects.
RTY
A more common standard for the design of a monitoring process is to choose a Four Sigma standard
TRUE
Defects Per Unit (DPU) is the number of defects in a sample divided by the number of units sampled.
TRUE
In a Six Sigma designed process half of the outcomes will occur above the mean of the process.
TRUE
Process quality design begins by determining the USL and LSL.
TRUE
RTY represents the probability that a process will complete all of the required steps without a failure.
TRUE
Setting a Six Sigma standard for a process requires that the process has been designed to meet this standard. You can not take a process that was designed to meet a Three Sigma standard and expect it to meet a Six Sigma standard without undertaking a serious re-engineering effort to improve the performance of the process
TRUE
The Voice of the Process, VOP, is represented by the LCL and UCL.
TRUE
The major problem with setting a Six Sigma standard for a process is cost.
TRUE
The problem with designing a Six Sigma process is that it can be quite costly to operate with such high quality standards.
TRUE
To deliver quality, the LCL and UCL of a process must be contained within the LSL and USL.
TRUE
When the DPMO is 6,210 this suggests a process that has been set to a standard of Four Sigma.
TRUE
When the consequences for failing to meet high standards are significant, such as in many areas of health care, Six Sigma standards of product or process design are justifiable.
TRUE
A process starts with 100 good pieces and 85 are produced. The FTY is ___ .
.85
A company places a order from its supplier for 100 units. When the order arrives a sample of 10 units is selected and tested. Each test measures four dimensions of the units. They include color consistency, quality, included instructions and packaging. Of the ten units sampled there are a total of three total problems found in two of the units. One unit had a single problem and other had two problems. The DPU is ___________ .
0.30
A process has two steps. The yield on the first step is 0.95. If the yield on the second step is 0.90, what is the process yield?
0.855
A process has three steps. The yield on each step is 0.9. What is the yield (RTY) of the process?
0.9 X 0.9 X 0.9
A Six Sigma process is one that produces products or delivers services such that there are fewer than ___ defects per million opportunities.
3.4
The mean of a process is 45. If the standard deviation of the process is 2, a process that has been set to Six (6) Sigma would produce 99.9997 percent of its parts between _____ and ____ .
33 to 57
If 100 items are sampled and one unit is found to have three defects, another is found to have one defect, and a third is found to have four defects. The remaining units have no defects. How many "Defects" have been found?
8
A Six Sigma designed process is one that produces products or delivers services such that there are fewer than 340 defects per million opportunities.
FALSE
A Six Sigma designed process should have no defects per Unit.
FALSE
A process has a mean of 150 and a standard deviation of 10. Six sigma limits will be 110 and 210.
FALSE
A restaurant quality control system has been designed as a Five Sigma process. Its goal is to ensure that food is free of contaminants. If 10,000 meals are served each month about 100 meals would have traces of contaminants.
FALSE
Every process should set Six Sigma as a quality goal.
FALSE
If the RTY is 80 percent, the likelihood that a process will suffer a failure or reject is 80 percent.
FALSE
It is not unreasonable to set surgical procedures at a hospital to a standard of Three Sigma.
FALSE
Only one defect can occur in one unit.
FALSE
Six Sigma limits imply that outcomes beyond six standard deviations on either side of the mean will never occur.
FALSE
The acronym DPMO means Defects Per Multiple Operations
FALSE
The process itself determines the LSL and USL.
FALSE
There is no difference between DPU and DPMO.
FALSE
To achieve quality the LSL and LCL must be the same. In additional the USL and UCL must be the same.
FALSE
The ratio of good parts produced at the end of a process divided by the number of parts that were started is called ______ .
FTY
The number of good units or pieces produced divided by the number of total units that originally started through the process is measured by the _______ .
First Time Yield
