Lean Six Sigma Black Belt UPDATED
Exam Questions and CORRECT Answers
The primary focus of Six Sigma - CORRECT ANSWER - quality and consistency
The acronym for the Lean Six Sigma cycle - CORRECT ANSWER - DMAIC
What does the acronym DPMO represent? - CORRECT ANSWER - Defects Per Million
Opportunities
The number of DPMO in a Six Sigma process. - CORRECT ANSWER - 3.4
What percent of the observations, data points, or events will fall between plus and minus 1
standard deviation of the mean? - CORRECT ANSWER - 68 Precent
What percent of the observations, data points, or events will fall within plus and minus 6
standard deviations of the mean? - CORRECT ANSWER - 99.9997 Percent
A process generates a sample mean beyond the UCL. But the process mean has not shifted. What
type of error has been made? - CORRECT ANSWER - Alpha
What type of chart is used to monitor sample means, when the size of the sample is between 12
and 25 and the data are continuous? - CORRECT ANSWER - X-Bar Chart
The statistical terms that define the quality expected by customers and include on a process
control chart. - CORRECT ANSWER - Lower Specification Limit and Upper
Specification Limit
The type of process control chart in which sample means are displayed and the data are
continuous. - CORRECT ANSWER - X-Bar Chart
,The type of process control chart that displays process variation when the sample size is less than
twelve and the data are continuous - CORRECT ANSWER - R-Chart
The distribution that describes the way in which sample means vary around the population mean.
- CORRECT ANSWER - Distribution of Sample Means
The statistic that measures the variation in a distribution by taking into consideration only the
highest and lowest values in a dataset. - CORRECT ANSWER - Range
Purpose of the X-Bar chart. - CORRECT ANSWER - To ensure that the process mean has
not shifted, and that the process is in-control.
Another phrase for a process flow diagram that illustrates process steps and delays. - CORRECT
ANSWER - Value Stream Map
A term that represents the real cause of a problem. - CORRECT ANSWER - Root Cause
What does Y=f(x) represent? - CORRECT ANSWER - The relationship between process
inputs and process outputs. Y represents outputs, and x represents inputs. Outputs are therefore a
'function of' inputs.
What is USL? - CORRECT ANSWER - Upper Specification Limit. The level above which
output is considered to be unacceptable by the customer. For example, service levels at a call
center where wait time is more than ten minutes.
The meaning of COPQ. - CORRECT ANSWER - Cost of Poor Quality. The 'total' costs
incurred by the organization when quality is less than desirable.
, Pareto Chart - CORRECT ANSWER - A variation of the ordered histogram displaying the
cumulative percent that eliminating successive problem categories will contribute to solving the
overall set of problems expressed in the chart.
Value Added - CORRECT ANSWER - A concept in Lean that identifies the value added
by a step in an operational process. Value added is defined from the customer's point-of-view. As
long as the customer receives value from a process step, it is considered "Value-Added."
Can a process mean be changed by moving the LCL and UCL? - CORRECT ANSWER -
No. The process itself would have to be changed. A change in the LCL and UCL would only
change the alpha and beta errors.
A goal when using a Value Stream Map analysis. - CORRECT ANSWER - Eliminate non-
value-added steps.
When designing a new X-Bar Chart, how is the process mean positioned on the chart? -
CORRECT ANSWER - Several preliminary groups of samples are taken - usually in the
range of five groups - and the average of all of these groups is used to estimate the process mean.
So we are talking about the average of the averages, or a "Grand Mean."
The statistic that expresses the variation in the distribution of sample means. - CORRECT
ANSWER - Standard Error of the Mean
The population mean is 60, and the standard deviation is 10. What percentage of observations
will fall between 40 and 80? - CORRECT ANSWER - 95 Percent
The likelihood that a sample result will fall within plus or minus two Standard Errors of the
Mean from the mean of a distribution of sample means. - CORRECT ANSWER - 95
Percent
What is a Business Case in a Lean Six Sigma project? - CORRECT ANSWER -A
document or report describing how a Lean Six-Sigma project will solve a business problem. It
does not focus on details which are left to the Project Charter.
Exam Questions and CORRECT Answers
The primary focus of Six Sigma - CORRECT ANSWER - quality and consistency
The acronym for the Lean Six Sigma cycle - CORRECT ANSWER - DMAIC
What does the acronym DPMO represent? - CORRECT ANSWER - Defects Per Million
Opportunities
The number of DPMO in a Six Sigma process. - CORRECT ANSWER - 3.4
What percent of the observations, data points, or events will fall between plus and minus 1
standard deviation of the mean? - CORRECT ANSWER - 68 Precent
What percent of the observations, data points, or events will fall within plus and minus 6
standard deviations of the mean? - CORRECT ANSWER - 99.9997 Percent
A process generates a sample mean beyond the UCL. But the process mean has not shifted. What
type of error has been made? - CORRECT ANSWER - Alpha
What type of chart is used to monitor sample means, when the size of the sample is between 12
and 25 and the data are continuous? - CORRECT ANSWER - X-Bar Chart
The statistical terms that define the quality expected by customers and include on a process
control chart. - CORRECT ANSWER - Lower Specification Limit and Upper
Specification Limit
The type of process control chart in which sample means are displayed and the data are
continuous. - CORRECT ANSWER - X-Bar Chart
,The type of process control chart that displays process variation when the sample size is less than
twelve and the data are continuous - CORRECT ANSWER - R-Chart
The distribution that describes the way in which sample means vary around the population mean.
- CORRECT ANSWER - Distribution of Sample Means
The statistic that measures the variation in a distribution by taking into consideration only the
highest and lowest values in a dataset. - CORRECT ANSWER - Range
Purpose of the X-Bar chart. - CORRECT ANSWER - To ensure that the process mean has
not shifted, and that the process is in-control.
Another phrase for a process flow diagram that illustrates process steps and delays. - CORRECT
ANSWER - Value Stream Map
A term that represents the real cause of a problem. - CORRECT ANSWER - Root Cause
What does Y=f(x) represent? - CORRECT ANSWER - The relationship between process
inputs and process outputs. Y represents outputs, and x represents inputs. Outputs are therefore a
'function of' inputs.
What is USL? - CORRECT ANSWER - Upper Specification Limit. The level above which
output is considered to be unacceptable by the customer. For example, service levels at a call
center where wait time is more than ten minutes.
The meaning of COPQ. - CORRECT ANSWER - Cost of Poor Quality. The 'total' costs
incurred by the organization when quality is less than desirable.
, Pareto Chart - CORRECT ANSWER - A variation of the ordered histogram displaying the
cumulative percent that eliminating successive problem categories will contribute to solving the
overall set of problems expressed in the chart.
Value Added - CORRECT ANSWER - A concept in Lean that identifies the value added
by a step in an operational process. Value added is defined from the customer's point-of-view. As
long as the customer receives value from a process step, it is considered "Value-Added."
Can a process mean be changed by moving the LCL and UCL? - CORRECT ANSWER -
No. The process itself would have to be changed. A change in the LCL and UCL would only
change the alpha and beta errors.
A goal when using a Value Stream Map analysis. - CORRECT ANSWER - Eliminate non-
value-added steps.
When designing a new X-Bar Chart, how is the process mean positioned on the chart? -
CORRECT ANSWER - Several preliminary groups of samples are taken - usually in the
range of five groups - and the average of all of these groups is used to estimate the process mean.
So we are talking about the average of the averages, or a "Grand Mean."
The statistic that expresses the variation in the distribution of sample means. - CORRECT
ANSWER - Standard Error of the Mean
The population mean is 60, and the standard deviation is 10. What percentage of observations
will fall between 40 and 80? - CORRECT ANSWER - 95 Percent
The likelihood that a sample result will fall within plus or minus two Standard Errors of the
Mean from the mean of a distribution of sample means. - CORRECT ANSWER - 95
Percent
What is a Business Case in a Lean Six Sigma project? - CORRECT ANSWER -A
document or report describing how a Lean Six-Sigma project will solve a business problem. It
does not focus on details which are left to the Project Charter.
