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Six Sigma Green Belt: Questions With Detailed Answers
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Six Sigma Green Belt: Questions With Detailed Answers
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Six Sigma Green Belt: Questions With Detailed AnswersIn Businesses that apply theory of constraint, which element of a process
receives immediate attention? Right Ans - The most problematic
Which distribution is appropriate for continuous data with a fixed upper
boundary and no lower boundary Right Ans - Lognormal
What is a lognormal distribution Right Ans - a continuous probability
distribution of a random variable whose logarithm is normally distributed.
This means if a variable (X) follows a lognormal distribution, then (Y = \ln(X))
follows a normal distribution
What are the key characteristics of lognormal distribution Right Ans -
Shape: The lognormal distribution is skewed to the right, meaning it has a
long tail on the positive side.
Parameters: It is characterized by two parameters: the mean ((\mu)) and
standard deviation ((\sigma)) of the variable's natural logarithm.
Applications: It is often used to model data that are positively skewed, such as
time to failure of a product,
Why is a lognormal distribution important in Six Sigma Right Ans - Process
Capability: Understanding the distribution of process data helps in assessing
process capability and performance.
Data Analysis: It aids in making more accurate predictions and decisions
based on the nature of the data.
What are the three most important characteristics of process metrics Right
Ans - Reliability
Reproducibility (multiple people do the same task)
Repeatability (1 person does the same task multiple times)
Who wrote Quality is Free? Right Ans - Phillip Crosby
What are conflict response strategies Right Ans - Collaboration
Competition
Avoidance
Accommodation
,Which conflict strategy is most appropriate for a fragile group Right Ans -
Accommodation
When is it appropriate to use competition strategy Right Ans - This
strategy is about standing your ground and pushing for your own solution. It's
suitable when quick, decisive action is needed, such as in emergencies, or
when the issue is vital to the project's success
When should you use avoidance strategy Right Ans - It can be useful when
the issue is trivial or when you need more time to gather information.
However, it should not be used for significant conflicts as it can lead to
unresolved issues festering1.
When should you use the accommodating strategy Right Ans - This
approach involves one party giving in to the wishes of another. It's effective
when the issue is more important to the other party or when maintaining
harmony is more critical than winning the argument1.
When should you use the Collaboration strategy Right Ans - This strategy
focuses on working together to find a win-win solution that satisfies all
parties. It's ideal for complex issues where different perspectives can lead to a
better outcome and when maintaining long-term relationships is important1.
How is takt time calculated? Right Ans - Demand divided by the amount of
time available:
Available Production Time: This includes the time you have for actual
production, accounting for planned downtime (like breaks) but excluding
changeovers or other non-productive moments.
Customer Demand: The number of units you need to manufacture within that
time frame.
What is takt time? Right Ans - Takt time represents the ideal pace at which
you should produce each unit to meet customer demand. Imagine it as the
heartbeat of your production line—a steady rhythm that ensures you neither
overproduce nor underproduce.
Why is takt time important? Right Ans - Capacity Planning: Takt time helps
you align your production capacity with customer demand. Think of it as
,comparing the ideal pace (takt time) with what you can realistically achieve
(operable takt time).
Flow and Waste Reduction: Balancing the line—ensuring each step moves at
the same pace—reduces waste and promotes flow. It's like getting all your
dancers to waltz gracefully together.
How do you calculate runs in a complete factorial design? Right Ans -
Levels to the power of factors
example: 4 levels with 3 factors = 4X4X4 =64 runs
3 levels with 4 factors = 3x3x3x3 = 81
Which parameter of statistical distribution relates to the sharpness of its
peak? Right Ans - Kurtosis
What are the types of Kurtosis and what do they mean? Right Ans -
Mesokurtic: This is the baseline, similar to a normal distribution. It has a
kurtosis value of 3. The tails are neither too heavy nor too light.
Leptokurtic: These distributions have heavy tails and a sharp peak. They have
a kurtosis value greater than 3, indicating more frequent extreme values.
Platykurtic: These distributions have light tails and a flatter peak. They have a
kurtosis value less than 3, indicating fewer extreme values
What does Kurtosis help identify? Right Ans - kurtosis helps in identifying
the presence of outliers and the likelihood of extreme events in your data.
What is Yield? Right Ans - The amount of completed product divided by the
original amount of product
One of the most popular critical to quality metrics
Ideal rate is 1 or 100%
What is scrap rate? Right Ans - Percentage of materials not used in
production
Throughput Yield Right Ans - Average percentage of completed units with
no defects
Rolled Throughput Yield Right Ans - The quality level that can be
anticipated after several steps of the process have been completed.
, Which method of creating a prioritization matrix is appropriate when time is
limited? Right Ans - Consensus criteria method
Full Analytical Criteria Matrix Right Ans - This matrix uses a detailed set of
criteria to evaluate and prioritize projects or tasks. Each criterion is weighted
based on its importance, and each option is scored against these criteria. This
method provides a comprehensive analysis but can be time-consuming1.
Consensus Criteria Matrix Right Ans - involves team members reaching a
consensus on the criteria and their weights. It's a more collaborative approach
and helps ensure that all team members agree on the priorities
Combination Matrix: Right Ans - combines elements of both the full
analytical and consensus criteria matrices. It allows for a detailed analysis
while also incorporating team consensus, making it a balanced approach
Impact/Urgency Matrix Right Ans - helps prioritize tasks based on their
impact and urgency. Tasks are categorized into four quadrants: high
impact/high urgency, high impact/low urgency, low impact/high urgency, and
low impact/low urgency.
Cause-and-Effect Matrix Right Ans - Also known as a prioritization matrix
for causes, this tool is used to prioritize potential causes of a problem based
on their impact on the outcome3.
Criteria-Based Matrix Right Ans - This matrix is used for prioritizing
solutions based on predefined criteria. It helps in selecting the best solution
by evaluating each option against the criteria
Gage R&R - what percentage of variation is acceptable? Right Ans - 10% or
less
Spaghetti Diagram Right Ans - Tool to identify inefficiency of
transportation/movement of work in a physical facility - shows lines between
each movement between steps. The thicker the line the more travel, you want
less travel from one area to another
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