Lean Six Sigma Green Belt Practice Questions
Prepare for LSSGB with more than an answer.
- Level
- Professional
Domains covered on the exam 6
- Define Phase
- Measure Phase
- Analyze Phase
- Improve Phase
- Control Phase
- Six Sigma and the Organization
- 1
The Cost of Poor Quality (COPQ) includes which of the following categories of costs? (Select ALL that apply)
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Correct answer: A, B, C, E
- 2
A project is in the Control phase. The team needs to create a document that provides front-line workers with clear, step-by-step instructions on how to perform a newly redesigned task to ensure consistency and maintain the improvements. What is this document called?
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Correct answer: B
A Standard Operating Procedure (SOP), also known as standard work, is a critical component of the Control phase. It provides detailed, written instructions on how to perform a routine task. The purpose of an SOP is to ensure that the improved process is performed consistently by everyone, which helps to reduce variation and sustain the gains achieved during the project.
- 3
A team is analyzing the relationship between advertising spend (X) and weekly sales (Y). They perform a simple linear regression and obtain the equation: Sales = 5000 + 2.5 * (Spend). The R-squared value is 0.85. How should the R-squared value be interpreted?
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Correct answer: C
R-squared, also known as the coefficient of determination, measures the proportion of the variance in the dependent variable (Sales) that is predictable from the independent variable (Spend). An R-squared of 0.85 means that 85% of the variability in sales is accounted for by the linear model based on advertising spend. This indicates a strong fit for the model.
- 4
When collecting Voice of the Customer (VOC) data, a team uses surveys, focus groups, and interviews. They then translate broad customer statements like "I want fast service" into specific, measurable engineering characteristics like "Order fulfillment time < 24 hours." This translation process is a key part of which methodology?
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Correct answer: A
Quality Function Deployment (QFD) is a structured approach for translating customer requirements (the 'Voice of the Customer') into specific design or process specifications. The 'House of Quality' is the most common matrix tool used in QFD to document this translation, ensuring that the final product or service design is directly linked to satisfying customer needs.
- 5
A team is measuring the length of a part in millimeters. This type of data is classified as __________.
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Correct answer: C
Continuous data (also known as variable data) is data that can take any value within a given range. Measurements like length, weight, temperature, and time are classic examples of continuous data because they can be measured to many decimal places. Attribute or discrete data, in contrast, can only take specific values and is typically counted (e.g., number of defects, pass/fail results).
- 6
A financial services company is analyzing loan application processing times. The data is heavily skewed to the right due to a few very complex applications that take significantly longer. Which measure of central tendency would provide the most representative value for a typical application's processing time?
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Correct answer: B
The median is the most appropriate measure of central tendency for skewed data. The mean is sensitive to outliers and extreme values, so the few complex applications would pull the mean higher, making it unrepresentative of a 'typical' value. The median, being the middle value, is not affected by these extreme values and thus provides a more accurate representation of the central point in a skewed distribution.
- 7
During a brainstorming session to identify potential causes for manufacturing defects, a project team generates over 50 possible causes. To effectively narrow down these causes for further investigation, which tool should the team use first?
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Correct answer: A
An Affinity Diagram is the most suitable tool for this situation. Its purpose is to organize a large number of ideas, opinions, or issues into natural groupings based on their inherent relationships. This allows the team to structure the 50+ causes into logical categories, making them easier to understand, discuss, and prioritize for further analysis with tools like a Fishbone diagram or Pareto chart.
- 8
A Green Belt is leading a project to reduce the cycle time of a claims processing operation. The team has implemented several improvements, including standardized work and a pull system. Which tool is most effective for monitoring the process to ensure the gains are sustained and to detect any new special cause variations?
flowchart TD A[Claim Received] --> B{Is Info Complete?} B -->|Yes| C[Data Entry] B -->|No| D[Request Missing Info] D --> A C --> E[Verification] E --> F[Approval] F --> G[Payment Processed]Show answer details
Correct answer: C
A Control Chart is the primary tool used in the Control phase for monitoring a process over time. It helps distinguish between common cause variation (inherent in the process) and special cause variation (due to specific, identifiable causes). By plotting cycle time data on a control chart, the team can visually track performance, verify the stability of the improved process, and quickly react to any signals that indicate the process has gone out of control.
- 9
A project team is developing a new software application and wants to proactively identify potential failures and their impact on the user. They need to prioritize these potential failures to focus their mitigation efforts. Which of the following tools is specifically designed for this purpose? (Select TWO)
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Correct answer: A, D
- 10
In Design of Experiments (DOE), an interaction effect occurs when the effect of one factor on the response variable depends on the level of another factor.
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Correct answer: A
This statement accurately defines an interaction effect in DOE. It's a crucial concept because it means factors cannot be optimized independently. For example, the optimal temperature for a chemical reaction might be different depending on which catalyst is used. Ignoring interactions can lead to incorrect conclusions and suboptimal process settings.
