SIX SIGMA GREEN BELT 2026/2027 EVALUATION EXAM
QUESTIONS AND SOLUTIONS RATED A+
✔✔Histogram - ✔✔a graphical representation of data in a bar chart format; used to
observe the shape of data
✔✔3 standard deviations - ✔✔contains 99.73 percent of values, represents the
expected limits of common cause variation necessary for stable and predictable process
✔✔Six Sigma Quality - ✔✔6 standard deviations in each direction; 3.4 defects per
million
✔✔Describing data - ✔✔need location, spread, shape, variation over time
✔✔Target - ✔✔what organizations promise customers; nominal; customer requirement
✔✔Shape - ✔✔histogram must be compared to expected shape, especially if not a bell
curve
✔✔Control charts - ✔✔statistical tool which shows the amount and type of variation
present in any process that is being monitored; describe the representative nature of a
stable predictable, in control process
✔✔Control Limits - ✔✔describe the representative nature of a stable process; identify
the expected limits of normal, random, or chance variation that is present in the
process; set by the process
✔✔Specification Limits - ✔✔describe the characteristics the product (or process) must
have in order to conform to customer requirements or to perform properly in the next
opreation
✔✔Out of Control Checks - ✔✔1. Is the shape of the histogram what was expected?
2. Are all the sample averages between the control limits for averages?
3. Are all the sample ranges between the control limit for ranges?
4. Is the pattern of variation as time goes by random? (Western Electric Rules); passing
these means there are no special cause variations
✔✔Western Electric Rules - ✔✔AT&T Quality Control handbook; conditions indicate
that the process is out of control
✔✔Process Capability - ✔✔defines limits we would normal expect virtually all
individuals to fall within; ability of the combination of people, machines, methods,
materials, and measurements to produce a product or service that will consistently meet
design specifications
, ✔✔Measuring Process Variability - ✔✔the proportion of output that can be produced
within design specifications; a long term prediction; measure of uniformity; can be
measured only if all special causes have been eliminated and the process is in a state
of statistical control
✔✔Components of Process Capability - ✔✔design specifications, centering of natural
variation, range or spread of variation
✔✔Capability Measures - ✔✔short term show the capability at a specific instance in
time; long term show the expected capability of the process based on statistical
projections using inherent process variability
✔✔Percent Non-Conforming - ✔✔reflects the proportion of the population that we
normally expect not to meet the process specifications; tail areas of normal curve
✔✔Motorola Shift - ✔✔the company rationalized that the mean shifts 1.5 standard
deviations as time goes by, which affects the sigma level; sigma level should be 4.5,
which produces a z-table value of 3.4 DPMO
✔✔Cp - ✔✔capability index that measures potential capability assuming that the
process average is equal to the midpoint of the specification limits and the process is
operating in statistical control; the maximum proportion of output that meets
specifications
✔✔Cpk - ✔✔capability index that reflects the process mean's proximity to either
specification limit; when the process is centered, it equals Cp; equal to sigma level
divided by 3
✔✔Define - ✔✔set the scope; identify the process; identify customers and what is
important to them, determine the problem, determine the desired outcomes, determine
what to measure, identify what is critical to quality, determine how to measure what is
critical
✔✔Defining Tools - ✔✔Process Analysis, Flow Charts/Check Sheets, Pareto Analysis,
Fishbones, Failure Mock Effects Analysis (FEMA), SIPOC Diagrams
✔✔Define Steps - ✔✔1. Business case;
2. Project charter;
3. Initial process mapping;
4. Voice of the customer
✔✔Measure - ✔✔Identify and verify critical quality characters, estimate current
capability, determine where you are relative to desired objectives
QUESTIONS AND SOLUTIONS RATED A+
✔✔Histogram - ✔✔a graphical representation of data in a bar chart format; used to
observe the shape of data
✔✔3 standard deviations - ✔✔contains 99.73 percent of values, represents the
expected limits of common cause variation necessary for stable and predictable process
✔✔Six Sigma Quality - ✔✔6 standard deviations in each direction; 3.4 defects per
million
✔✔Describing data - ✔✔need location, spread, shape, variation over time
✔✔Target - ✔✔what organizations promise customers; nominal; customer requirement
✔✔Shape - ✔✔histogram must be compared to expected shape, especially if not a bell
curve
✔✔Control charts - ✔✔statistical tool which shows the amount and type of variation
present in any process that is being monitored; describe the representative nature of a
stable predictable, in control process
✔✔Control Limits - ✔✔describe the representative nature of a stable process; identify
the expected limits of normal, random, or chance variation that is present in the
process; set by the process
✔✔Specification Limits - ✔✔describe the characteristics the product (or process) must
have in order to conform to customer requirements or to perform properly in the next
opreation
✔✔Out of Control Checks - ✔✔1. Is the shape of the histogram what was expected?
2. Are all the sample averages between the control limits for averages?
3. Are all the sample ranges between the control limit for ranges?
4. Is the pattern of variation as time goes by random? (Western Electric Rules); passing
these means there are no special cause variations
✔✔Western Electric Rules - ✔✔AT&T Quality Control handbook; conditions indicate
that the process is out of control
✔✔Process Capability - ✔✔defines limits we would normal expect virtually all
individuals to fall within; ability of the combination of people, machines, methods,
materials, and measurements to produce a product or service that will consistently meet
design specifications
, ✔✔Measuring Process Variability - ✔✔the proportion of output that can be produced
within design specifications; a long term prediction; measure of uniformity; can be
measured only if all special causes have been eliminated and the process is in a state
of statistical control
✔✔Components of Process Capability - ✔✔design specifications, centering of natural
variation, range or spread of variation
✔✔Capability Measures - ✔✔short term show the capability at a specific instance in
time; long term show the expected capability of the process based on statistical
projections using inherent process variability
✔✔Percent Non-Conforming - ✔✔reflects the proportion of the population that we
normally expect not to meet the process specifications; tail areas of normal curve
✔✔Motorola Shift - ✔✔the company rationalized that the mean shifts 1.5 standard
deviations as time goes by, which affects the sigma level; sigma level should be 4.5,
which produces a z-table value of 3.4 DPMO
✔✔Cp - ✔✔capability index that measures potential capability assuming that the
process average is equal to the midpoint of the specification limits and the process is
operating in statistical control; the maximum proportion of output that meets
specifications
✔✔Cpk - ✔✔capability index that reflects the process mean's proximity to either
specification limit; when the process is centered, it equals Cp; equal to sigma level
divided by 3
✔✔Define - ✔✔set the scope; identify the process; identify customers and what is
important to them, determine the problem, determine the desired outcomes, determine
what to measure, identify what is critical to quality, determine how to measure what is
critical
✔✔Defining Tools - ✔✔Process Analysis, Flow Charts/Check Sheets, Pareto Analysis,
Fishbones, Failure Mock Effects Analysis (FEMA), SIPOC Diagrams
✔✔Define Steps - ✔✔1. Business case;
2. Project charter;
3. Initial process mapping;
4. Voice of the customer
✔✔Measure - ✔✔Identify and verify critical quality characters, estimate current
capability, determine where you are relative to desired objectives
