SSGI YELLOW BELT EXAM
QUESTIONS AND ANSWERS
What is range? - Correct Answers -the difference between the highest and lowest
scores in a distribution
The highest value is 30 and the lowest value is 10. What is the range? - Correct
Answers -20
Why is standard deviation preferred over range? - Correct Answers -Standard deviation
takes into consideration every value in a dataset
What does range and standard deviation help to measure in Six Sigma? - Correct
Answers -Process variation
What is one downfall associated with range? - Correct Answers -It only takes into
account the most extreme values in a dataset
What does the x axis on a control chart represent? - Correct Answers -Time
What does the vertical line on a control chart represent? - Correct Answers -The
measurement of process outputs (i.e. the number of defects or customer satisfaction
score)
What is the center line of a control chart called? - Correct Answers -The Target
What is the line below the Target on a control chart called? - Correct Answers -The
Lower Control Limit
What is it called when a sample result falls between the Upper Control Limit and the
Lower Control Limit on a control chart? - Correct Answers -The process is in control
What does the upper line (Upper Control Limit) on a control chart represent? - Correct
Answers -The largest deviation above the target that would be acceptable in a process
What are the special properties of a standard deviation on a normal distribution curve
(bell curve)? - Correct Answers -95% of the observations will occur within +/- two
standard deviations from the mean of the distribution
, 99.7% of the observations will occur within +/- three standard deviations from the mean
of the distribution
Weight follows a normal distribution. If the average weight for men is 175 pounds, and
the standard deviation is 20 pounds, then 95% of men weigh between ________ and
________, and 99.7% of men weigh between ________ and ________. - Correct
Answers -95% between 135 pounds and 215 pounds
99.7% between 115 pounds and 235 pounds
Where does Six Sigma get its name? (and definition) - Correct Answers -On a normal
distribution, 99.9997% of outcomes will fall within +/- 6 standard deviations from the
mean
Six Sigma Process is one that produces products or delivers services such that there
are fewer than 3.4 defects per million opportunities
Is it realistic for all companies to strive for Six Sigma? What is the general quality target
for most organizations? - Correct Answers -No. The cost to get this near level of
perfection would be prohibitive to most companies. Four Sigma is generally the quality
target for most organizations
What is the equation for Defects Per Unit (DPU)? - Correct Answers -Total number of
defects in a sample / number of units sampled
In a sample of 50 orders processed, a single order had two wrong items. What is the
Defects Per Unit (DPU)? - Correct Answers -4 percent (2/50)
What is Rolled Throughput Yield? What does it mean if a process has an RTY of 90%?
- Correct Answers -Likelihood that a process will complete all of the required steps
without any failures or rejects. An RTY of 90% means there is a 90% likelihood that the
process will be completed without failures
What is First Time Yield? What does an FTY of 75% mean? - Correct Answers -FTY is
the number of good units produced divided by the number of total units that started
through the process
If 100 people started a training process, but only 75 finished, the FTY would be 75%
What is the Distribution of Sample Means? How do the Sample Means cluster? -
Correct Answers -the collection of sample means for all the possible random samples of
a particular size (n) that can be obtained from a population, following a normal
distribution curve
The sample means cluster around the center of the distribution and cluster around the
true, but unknown, population mean
QUESTIONS AND ANSWERS
What is range? - Correct Answers -the difference between the highest and lowest
scores in a distribution
The highest value is 30 and the lowest value is 10. What is the range? - Correct
Answers -20
Why is standard deviation preferred over range? - Correct Answers -Standard deviation
takes into consideration every value in a dataset
What does range and standard deviation help to measure in Six Sigma? - Correct
Answers -Process variation
What is one downfall associated with range? - Correct Answers -It only takes into
account the most extreme values in a dataset
What does the x axis on a control chart represent? - Correct Answers -Time
What does the vertical line on a control chart represent? - Correct Answers -The
measurement of process outputs (i.e. the number of defects or customer satisfaction
score)
What is the center line of a control chart called? - Correct Answers -The Target
What is the line below the Target on a control chart called? - Correct Answers -The
Lower Control Limit
What is it called when a sample result falls between the Upper Control Limit and the
Lower Control Limit on a control chart? - Correct Answers -The process is in control
What does the upper line (Upper Control Limit) on a control chart represent? - Correct
Answers -The largest deviation above the target that would be acceptable in a process
What are the special properties of a standard deviation on a normal distribution curve
(bell curve)? - Correct Answers -95% of the observations will occur within +/- two
standard deviations from the mean of the distribution
, 99.7% of the observations will occur within +/- three standard deviations from the mean
of the distribution
Weight follows a normal distribution. If the average weight for men is 175 pounds, and
the standard deviation is 20 pounds, then 95% of men weigh between ________ and
________, and 99.7% of men weigh between ________ and ________. - Correct
Answers -95% between 135 pounds and 215 pounds
99.7% between 115 pounds and 235 pounds
Where does Six Sigma get its name? (and definition) - Correct Answers -On a normal
distribution, 99.9997% of outcomes will fall within +/- 6 standard deviations from the
mean
Six Sigma Process is one that produces products or delivers services such that there
are fewer than 3.4 defects per million opportunities
Is it realistic for all companies to strive for Six Sigma? What is the general quality target
for most organizations? - Correct Answers -No. The cost to get this near level of
perfection would be prohibitive to most companies. Four Sigma is generally the quality
target for most organizations
What is the equation for Defects Per Unit (DPU)? - Correct Answers -Total number of
defects in a sample / number of units sampled
In a sample of 50 orders processed, a single order had two wrong items. What is the
Defects Per Unit (DPU)? - Correct Answers -4 percent (2/50)
What is Rolled Throughput Yield? What does it mean if a process has an RTY of 90%?
- Correct Answers -Likelihood that a process will complete all of the required steps
without any failures or rejects. An RTY of 90% means there is a 90% likelihood that the
process will be completed without failures
What is First Time Yield? What does an FTY of 75% mean? - Correct Answers -FTY is
the number of good units produced divided by the number of total units that started
through the process
If 100 people started a training process, but only 75 finished, the FTY would be 75%
What is the Distribution of Sample Means? How do the Sample Means cluster? -
Correct Answers -the collection of sample means for all the possible random samples of
a particular size (n) that can be obtained from a population, following a normal
distribution curve
The sample means cluster around the center of the distribution and cluster around the
true, but unknown, population mean
