LSSYB Sample Questions & Answers
Define, measure and control phases split the weighting evenly, covering project selection and Six Sigma basics, process definition with the statistics behind measurement system analysis, and lean-based control plans.
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- Question 1Intermediate
Measure Phase · Process Mapping, SIPOC, Value Stream Map
A Yellow Belt is tasked with creating a high-level map of a new employee onboarding process. The map must clearly show the suppliers of inputs (e.g., HR, IT), the key inputs (e.g., new hire forms, laptop), the major process steps, the primary outputs (e.g., trained employee), and the customers of the process (e.g., hiring manager). Which tool is specifically designed for this purpose?
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Correct answer: C
A SIPOC (Suppliers, Inputs, Process, Outputs, Customers) diagram is a high-level process mapping tool used to define the scope of a process. It perfectly matches the requirements described: identifying the suppliers, inputs, process, outputs, and customers. A Value Stream Map includes data on cycle times and waste, and a detailed flowchart would show much more granularity than needed for this initial high-level view.
- Question 2Intermediate
Define Phase · Pareto Analysis (80:20 rule)
A project team is trying to prioritize a list of 15 potential causes for product defects. They have collected frequency data for each cause over the past month. Which tool would be most effective in helping the team identify the 'vital few' causes that are responsible for most of the problems?
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Correct answer: D
A Pareto Chart is a bar chart where the values are plotted in descending order of relative frequency, with a cumulative frequency line. Its primary purpose is to apply the Pareto principle (80/20 rule) to highlight the most significant factors in a dataset. This allows the team to focus their efforts on the 'vital few' causes that have the greatest impact.
- Question 3Intermediate
Measure Phase · Basic Statistics
A data analyst is examining the distribution of call handling times at a call center. The data is heavily skewed to the right, with a few very long calls. Which measure of central tendency would be most representative of a 'typical' call time in this scenario?
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Correct answer: B
For skewed data, the median is a more robust measure of central tendency than the mean. The mean is sensitive to extreme values (outliers), so the few very long calls would pull the mean to a higher value that doesn't represent the typical call. The median, being the middle value, is unaffected by these outliers and provides a better picture of the center of the data.
graph TD A[Right Skewed Distribution] --> B{Mean > Median > Mode}; B --> C(Mean is pulled by long tail); B --> D(Median is the best measure of center); - Question 4Intermediate
Control Phase · Kanban
A manufacturing team wants to implement a system that signals the need to replenish parts for an assembly station only when they are needed, preventing overproduction and excess inventory. Which Lean tool is specifically designed for this purpose?
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Correct answer: C
Kanban is a scheduling system for lean manufacturing that signals when to move or produce items. It operates as a 'pull' system, where downstream processes signal to upstream processes when more materials are needed. This prevents the buildup of excess inventory (a form of waste) and ensures production is based on actual demand.
- Question 5Advanced
Measure Phase · Gage Repeatability & Reproducibility
A team conducts a Gage R&R study on a new measurement device. The results show that the % Contribution from Repeatability is high, but the % Contribution from Reproducibility is very low. What is the most likely interpretation of these results?
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Correct answer: B
Repeatability is the variation observed when the same operator measures the same part multiple times with the same device. High repeatability indicates that the measurement device (gage) itself is inconsistent. Reproducibility is the variation observed when different operators measure the same part with the same device. Low reproducibility indicates that there is little variation between operators.
- Question 6Intermediate
Define Phase · Basic Six Sigma Metrics
A project team is calculating performance metrics for a three-step process. Step 1 has a First Time Yield (FTY) of 95%. Step 2 has an FTY of 90%. Step 3 has an FTY of 98%. What is the Rolled Throughput Yield (RTY) for the entire process?
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Correct answer: C
Rolled Throughput Yield (RTY) is calculated by multiplying the First Time Yield (FTY) of each process step together.
RTY = FTY1 * FTY2 * FTY3
RTY = 0.95 * 0.90 * 0.98 = 0.8379, or 83.8%. - Question 7Beginner
Define Phase · 5S Methodology
A hospital is implementing a 5S program in its emergency room supply closets. A Yellow Belt is leading the effort. During which step of 5S would the team establish specific locations for all items using labels, floor markings, and shadow boards?
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Correct answer: B
The 'Set in Order' (Seiton) step focuses on organizing the remaining items after the 'Sort' step. The goal is to ensure that everything has a specific, designated place, making items easy to find, use, and return. Using labels, floor markings, and shadow boards are key activities of this phase.
- Question 8Intermediate
Measure Phase · Measurement System Analysis
The primary goal of a Measurement System Analysis (MSA) is to quantify the total variation in the manufacturing process. True or False?
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Correct answer: B
This statement is false. The primary goal of an MSA is to determine how much of the observed variation is due to the measurement system itself, rather than the actual process. It separates measurement variation from process variation. This ensures that the data collected is trustworthy before analyzing the process itself.
- Question 9Beginner
Define Phase · Six Sigma Roles & Responsibilities
A project charter has been drafted for an improvement project. It outlines the problem, goals, scope, and team members. Which stakeholder is primarily responsible for approving the charter, securing resources, and removing organizational barriers for the project?
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Correct answer: A
The Project Champion or Sponsor is a manager or executive who has the authority to commit resources, approve the project charter, and remove organizational roadblocks. They are the primary advocate for the project within the organization's leadership.
- Question 10Intermediate
Measure Phase · Concept of Stability
A team is using a control chart to monitor the number of daily customer complaints. For 25 consecutive days, the number of complaints has remained below the Upper Control Limit (UCL) and above the Lower Control Limit (LCL), with points randomly scattered around the center line. What can be concluded about the process?
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Correct answer: C
A process is considered stable or in statistical control when the data points on a control chart fall between the control limits and do not exhibit any non-random patterns (like trends, shifts, or cycles). The variation present is considered 'common cause' or inherent to the process. Stability does not automatically mean the process is capable (meeting customer specifications).
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