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LPSCE practice questions

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Question 1Lean Principles and Waste Elimination

In Lean thinking, which activity is classified as pure waste because it adds no value from the customer's perspective?

  1. Machining a bore to the drawing tolerance
  2. Waiting for a batch oven to fill before loading parts Correct answer.
  3. Inspecting a safety-critical weld
  4. Packaging a product for shipment

Explanation

Lean defines value only from the customer's viewpoint, and waiting consumes time without changing the product's form, fit, or function. Machining, required inspection, and packaging are either value-adding or necessary non-value-adding work. Pure waste is activity the customer would refuse to pay for.

Question 2Lean Principles and Waste Elimination

A team maps its order-entry process and finds that each order is keyed into three separate systems. Under the classic seven wastes, how should this be classified?

  1. Overprocessing Correct answer.
  2. Overproduction
  3. Inventory
  4. Motion

Explanation

Overprocessing covers doing more work than the customer values, including redundant data entry and duplicate approvals. The customer does not pay for three system entries, and the extra steps add error risk. Overproduction concerns making too much too early, inventory concerns stored items, and motion concerns people movement.

Question 3Lean Principles and Waste Elimination

Which of the following best describes the purpose of a value stream map in a Lean transformation?

  1. To document individual work instructions at each station
  2. To calculate the standard cost of each product family
  3. To record employee training records for audit purposes
  4. To show material and information flow with lead-time data to expose waste Correct answer.

Explanation

A value stream map depicts both material and information flow across a product family and quantifies process time versus lead time. That contrast reveals where delay and waste accumulate. Work instructions, training records, and cost accounting serve different purposes.

Question 4Lean Principles and Waste Elimination

A production line produces 480 units in a 480-minute shift with no breaks. What is the takt time?

  1. 2 minutes per unit
  2. 480 minutes per unit
  3. 1 minute per unit Correct answer.
  4. 0.5 minutes per unit

Explanation

Takt time equals available production time divided by customer demand, so 480 minutes divided by 480 units gives 1 minute per unit. It sets the pace at which one unit must be completed to meet demand. It is a demand-driven target, not a measure of actual cycle time.

Question 5Lean Principles and Waste Elimination

In the 5S method, what does the second S, Seiton (set in order), primarily require?

  1. Removing items not needed for current work
  2. Auditing adherence to the standards
  3. Assigning a defined location and quantity for each needed item Correct answer.
  4. Scheduling periodic cleaning of equipment

Explanation

Seiton establishes a place for everything needed and everything in its place, including marked locations and set quantities. Removing unneeded items is Seiri, cleaning is Seiso, and auditing is Shitsuke. A defined location reduces search time and supports visual control.

Question 6Lean Principles and Waste Elimination

Which statement correctly distinguishes push from pull in a Lean production system?

  1. Push eliminates queues; pull creates buffers between processes
  2. Push releases work based on a schedule; pull releases work based on downstream consumption Correct answer.
  3. Push relies on kanban cards; pull relies on MRP schedules
  4. Push applies only to services; pull applies only to manufacturing

Explanation

Push systems release production according to a forecast or schedule regardless of downstream status, while pull systems authorize work when the downstream step consumes output. Kanban is a common pull mechanism but is not the definition itself. The distinction applies to services as well as manufacturing.

Question 7Lean Principles and Waste Elimination

A team standardizes a task so that each operator performs it the same way every cycle. Which Lean benefit does this standardization primarily enable?

  1. Removal of the requirement for customer feedback
  2. Guaranteed reduction of raw material cost
  3. A stable baseline from which improvement and deviation detection become possible Correct answer.
  4. Elimination of the need for any inspection activity

Explanation

Standard work captures the current best method and creates a baseline; without it, variation cannot be distinguished from improvement. It supports training and visual control of deviation. It does not eliminate inspection, reduce material cost by itself, or replace customer input.

Question 8Lean Principles and Waste Elimination

What is the primary intent of a kaizen event?

  1. To make focused, rapid improvement in a defined area using a cross-functional team Correct answer.
  2. To document existing procedures for audit compliance
  3. To purchase automation that removes manual labor
  4. To replace long-term strategy with short-term cost cutting

Explanation

A kaizen event concentrates a cross-functional team on a bounded process for a short period to implement improvements quickly. It complements rather than replaces strategic planning. Documentation and capital equipment may result, but they are not the purpose.

Question 9Lean Principles and Waste Elimination

A work cell keeps 12 units of finished goods between it and the downstream assembly step, which consumes about 4 units per hour. What does this buffer represent in terms of time?

  1. 3 hours of inventory Correct answer.
  2. 12 hours of inventory
  3. 48 hours of inventory
  4. 4 hours of inventory

Explanation

Inventory time equals quantity divided by consumption rate, so 12 units divided by 4 units per hour gives 3 hours. Expressing stock in time makes the hidden lead time visible. This is why Lean practitioners convert inventory counts into days or hours of coverage.

Question 10Lean Principles and Waste Elimination

During a gemba walk, a supervisor notices operators walking several meters to retrieve fasteners each cycle. Which waste is present, and what is the most direct countermeasure?

  1. Transport waste; purchase a larger delivery cart
  2. Defect waste; add a second inspection of the fasteners
  3. Motion waste; relocate and point-of-use the fasteners at the station Correct answer.
  4. Inventory waste; increase the fastener stock held at the line

Explanation

Walking to fetch materials is motion waste, and the direct countermeasure is placing items at the point of use within the operator's reach. Adding stock or a bigger cart does not remove the travel. Inspection addresses defects, which are not the issue described.

Question 11Lean Principles and Waste Elimination

A process has a cycle time of 55 seconds at one station while takt time is 60 seconds. What does this indicate?

  1. The station is balanced with slight capacity margin Correct answer.
  2. Takt time should be recalculated upward
  3. The station cannot meet demand and requires kaizen
  4. The station is overstaffed and should be reduced

Explanation

When cycle time is at or just below takt time, the station can meet demand with a small margin. The gap of 5 seconds represents limited but sufficient capacity, not a constraint. Only when cycle time exceeds takt time does the station block demand.

Question 12Lean Principles and Waste Elimination

A kanban pull system uses cards to authorize replenishment. What happens when a downstream process has not consumed a bin of parts?

  1. The parts are scrapped to prevent storage cost
  2. The upstream process stops producing that part until a card is freed Correct answer.
  3. The card is duplicated to increase buffer stock
  4. The upstream process continues producing to keep machines busy

Explanation

In a kanban system, production is authorized only when a card is released by consumption. If downstream has not consumed, no card is available and upstream halts that item, capping work in process. Keeping machines busy regardless of need is the push behavior kanban is designed to prevent.

Question 13Lean Principles and Waste Elimination

Which situation is the clearest example of the waste of overproduction?

  1. Finished goods sit in a warehouse awaiting a customer order
  2. A machine produces a batch of 500 parts when the next process needs 200 this week Correct answer.
  3. A clerk re-enters the same data into two systems
  4. An operator walks 10 meters to collect a tool

Explanation

Overproduction means making more, or earlier, than the next process requires; producing 500 when 200 are needed is the classic case. It is often called the worst waste because it generates other wastes such as inventory and transport. The other options describe motion, overprocessing, and inventory respectively.

Question 14Lean Principles and Waste Elimination

A team calculates that a product spends 2 days in queue and 40 minutes being processed across the value stream. What is the most defensible interpretation?

  1. Lead time cannot be assessed without cost data
  2. Value-adding time dominates the total lead time
  3. The process is already Lean because processing is short
  4. Queue time dominates, so flow improvement has large leverage Correct answer.

Explanation

Two days of queue versus 40 minutes of processing shows that most lead time is waiting, which is non-value-adding. Reducing queue through flow, pull, and smaller batches offers the greatest lead-time leverage. Cost data is not required to see this ratio.

Question 15Lean Principles and Waste Elimination

A poka-yoke device is installed on an assembly fixture. Which description matches its function?

  1. It records operator attendance for payroll
  2. It measures output rate and reports it to management
  3. It makes an incorrect assembly physically impossible or immediately obvious Correct answer.
  4. It schedules preventive maintenance automatically

Explanation

Poka-yoke, or error proofing, prevents mistakes from becoming defects by making the wrong action impossible or instantly detectable. It addresses the source of defects rather than measuring output. Maintenance scheduling and attendance tracking are unrelated functions.

Question 16Lean Principles and Waste Elimination

An andon cord is pulled at a station. What is the expected Lean response?

  1. Team support responds promptly to help resolve the condition at the station Correct answer.
  2. The operator is disciplined for interrupting production
  3. The line continues and the signal is logged for monthly review
  4. The signal is ignored unless a defect reaches the customer

Explanation

Andon signals a deviation so that help arrives quickly and the problem is addressed before defects pass downstream. The intent is fast response and learning, not punishment or deferred logging. If the issue cannot be resolved within the defined window, the line may stop.

Question 17Lean Principles and Waste Elimination

Which pair correctly matches a Lean tool with the waste it most directly addresses?

  1. SMED with waiting caused by long changeovers Correct answer.
  2. Standard work with transport between buildings
  3. Kanban with defects in raw material
  4. 5S with overproduction of finished goods

Explanation

SMED reduces changeover time, which shrinks the batch-driven waiting and enables smaller lots. 5S addresses workplace organization rather than overproduction, kanban controls flow rather than material defects, and standard work does not directly address building layout. Matching tools to wastes keeps improvement efforts focused.

Question 18Lean Principles and Waste Elimination

A process currently requires 90 minutes for a changeover. Applying SMED, a team converts 50 minutes of internal setup to external setup and reduces the remaining internal work by half. What is the new changeover time?

  1. 40 minutes
  2. 25 minutes
  3. 20 minutes Correct answer.
  4. 45 minutes

Explanation

After moving 50 minutes to external, 40 minutes of internal work remain. Halving that internal work gives 20 minutes. SMED separates internal setup, which requires the machine stopped, from external setup, which can be done while running.

Question 19Lean Principles and Waste Elimination

A manager proposes solving a quality problem by adding a final inspection station. How should a Lean practitioner evaluate this proposal?

  1. Treat it as a temporary containment while root cause is addressed at the source Correct answer.
  2. Adopt it permanently, because detection is cheaper than prevention
  3. Reject it, because inspection is never permitted in Lean systems
  4. Accept it, because inspection guarantees that no defects ship

Explanation

Inspection detects defects after they are created and adds cost without improving the process. Lean treats it as temporary containment while the root cause is eliminated through error proofing and standard work. Permanent reliance on inspection institutionalizes the waste.

Question 20Lean Principles and Waste Elimination

In a Lean service process, which example best represents the waste of waiting from the customer's perspective?

  1. A file is stored in three separate archives
  2. A call center agent uses a script that is longer than needed
  3. A customer holds for 14 minutes before reaching an agent Correct answer.
  4. An analyst walks to a printer on another floor

Explanation

Customer hold time is waiting, a direct non-value-adding delay experienced by the customer. Excess scripting is overprocessing, duplicate archiving is inventory of information, and walking to a printer is motion. Naming the waste from the customer's viewpoint sharpens improvement priorities.

Question 21Lean Principles and Waste Elimination

A line runs 450 minutes per shift and demand is 900 units. Actual cycle time is 28 seconds. Which conclusion is correct?

  1. Takt time cannot be computed from these figures
  2. The line has excess capacity because cycle time is below takt time Correct answer.
  3. The line is capacity-constrained because cycle time exceeds takt time
  4. The line is perfectly balanced against takt time

Explanation

Takt time is 450 minutes times 60 seconds divided by 900 units, which equals 30 seconds. Actual cycle time of 28 seconds is below takt, so the line can meet demand with a small margin. Capacity is constrained only when cycle time exceeds takt.

Question 22Lean Principles and Waste Elimination

A value stream map shows a process with 99 percent first-pass yield across four sequential steps. Roughly what is the rolled throughput yield, and what does it imply?

  1. About 96 percent; hidden rework accumulates across steps Correct answer.
  2. About 100 percent; sequential steps cannot compound loss
  3. About 99 percent; defects are negligible across the stream
  4. About 25 percent; each step fails independently

Explanation

Rolled throughput yield multiplies the yields of sequential steps, so 0.99 raised to the fourth power is approximately 0.96. High individual yields can mask substantial cumulative loss when steps are chained. This is why flow-level quality measures matter more than station-level ones.

Question 23Lean Principles and Waste Elimination

A team reduces batch size from 200 to 50 units in a process with a 10-minute setup per batch and a 30-second per-unit cycle. Ignoring setup, how does average work-in-process time change if WIP is proportional to batch size?

  1. It remains unchanged because cycle time is fixed
  2. It decreases to roughly one quarter of the original Correct answer.
  3. It increases fourfold due to more frequent changeovers
  4. It doubles because setups occur more often

Explanation

When batch size falls by a factor of four, the queue of units awaiting processing falls proportionally, so average WIP time drops to about one quarter. Smaller batches shorten lead time and expose problems sooner. The added setup burden is a separate trade-off addressed by SMED.

Question 24Lean Principles and Waste Elimination

A plant claims to operate pull, yet planners release work daily to every station based on forecast. Work in process is high and lead times vary widely. Which diagnosis is most consistent with Lean theory?

  1. Lead-time variation is unrelated to the release mechanism
  2. High WIP proves the pull system is working as designed
  3. The system is true pull, because planners are involved in releasing work
  4. The system is push disguised as pull, because releases are not tied to downstream consumption Correct answer.

Explanation

Pull authorizes work only when downstream consumption frees capacity; forecast-based release to every station is push regardless of labeling. High and variable WIP is a predictable symptom of untethered releases. True pull caps WIP and stabilizes lead time.

Question 25Lean Principles and Waste Elimination

A leader wants waste elimination to persist after a kaizen event. Which action most directly supports sustainment?

  1. Announcing the savings in a company newsletter
  2. Restoring the original method once the event team disbands
  3. Documenting the new standard work and auditing it with daily visual management Correct answer.
  4. Increasing batch sizes to simplify scheduling

Explanation

Sustainment depends on embedding the improved method as standard work, making deviations visible, and reviewing performance routinely. Communication alone does not hold gains. Reverting to the old method or enlarging batches would erode the improvement.

Question 26Lean Principles and Waste Elimination

In the Lean seven-wastes model, which item is classified as the waste of motion rather than the waste of transportation?

  1. A forklift carrying pallets of raw material between two buildings on the site
  2. A truck delivering finished goods from the plant to a distribution center
  3. An operator reaching and bending repeatedly to pick parts from a low bin at the workstation Correct answer.
  4. A conveyor moving subassemblies from one department to the next

Explanation

Motion refers to movement of the operator's own body within the workstation, such as reaching, bending, walking, or twisting that adds no value to the product. Transportation refers to moving materials or products between locations. Only the operator's reaching and bending is bodily movement at the station, so it is motion.

Question 27Lean Principles and Waste Elimination

A clerk must re-enter the same customer address into three separate systems because the software cannot share data. Under the Lean seven-wastes model, which waste does this re-entry most directly represent?

  1. Overprocessing Correct answer.
  2. Waiting
  3. Defects
  4. Inventory

Explanation

Overprocessing is effort that adds no value for the customer, and duplicative data entry because systems are not integrated is a classic office example. The clerk performs extra steps the customer would never pay for. Waiting, inventory, and defects describe different conditions and do not fit re-entering data that is already known.

Question 28Lean Principles and Waste Elimination

A production area holds 480 units of work in process, and the line completes 40 units per hour. Using Little's Law, what is the approximate flow time through the area?

  1. 4 hours
  2. 12 hours Correct answer.
  3. 8 hours
  4. 24 hours

Explanation

Little's Law states that flow time equals work in process divided by throughput. With 480 units in process and 40 units completed per hour, the average time a unit spends in the area is 480 divided by 40, or 12 hours. This shows how excess WIP directly lengthens lead time even when processing speed is unchanged.

Question 29Lean Principles and Waste Elimination

A team maps a process and finds that only 6 of the 40 steps a customer would pay for actually change the product's form or information. Which conclusion does Lean thinking support?

  1. The ratio of 6 to 40 is the process cycle efficiency and cannot be improved further
  2. The 6 value-adding steps should be automated first, since they are the only ones that matter
  3. The 34 non-value-adding steps should be eliminated or reduced, since they consume time without adding value Correct answer.
  4. The 34 non-value-adding steps are acceptable because some are required by regulation

Explanation

Value-added work is what the customer would pay for, and steps that do not change form, fit, or function are candidates for elimination, reduction, or simplification. Some non-value-adding steps may be necessary, but Lean practice still works to minimize them. Automating only the value-adding steps leaves the larger burden of waste untouched.

Question 30Lean Principles and Waste Elimination

A value stream map shows an upstream stamping process that runs large batches and pushes parts into a downstream welding cell, which then waits with excess stock. The welding cell also produces at a rate faster than the customer consumes. Which interpretation best fits Lean waste analysis?

  1. The excess stock is acceptable because it protects welding from stamping downtime
  2. The welding cell should increase its output further to absorb the upstream batches
  3. Overproduction upstream creates the downstream excess stock, which is inventory waste and also hides other problems Correct answer.
  4. The stamping batch is the only waste, because welding output matches its own capacity

Explanation

Producing ahead of downstream consumption is overproduction, and the stock it creates between processes is inventory waste. Excess inventory also conceals problems such as downtime and imbalance rather than solving them. Increasing welding output would worsen the mismatch with customer demand.

Question 31Six Sigma Fundamentals and DMAIC

In DMAIC, which phase formally establishes the project charter, identifies the customer and defines the problem statement?

  1. Define Correct answer.
  2. Analyze
  3. Measure
  4. Control

Explanation

The Define phase authorizes the project: it produces the charter, names the process owner and sponsor, captures the voice of the customer, and states the problem in measurable terms. Later phases depend on this scope being clear before data collection begins.

Question 32Six Sigma Fundamentals and DMAIC

Which set of phases correctly orders the DMAIC roadmap?

  1. Measure, Define, Analyze, Control, Improve
  2. Define, Analyze, Measure, Improve, Control
  3. Define, Measure, Analyze, Improve, Control Correct answer.
  4. Define, Measure, Improve, Analyze, Control

Explanation

DMAIC always sequences Define, Measure, Analyze, Improve, Control. Analysis requires a trustworthy measurement baseline, and improvement follows confirmed root causes, so swapping Measure and Analyze or moving Improve ahead of Analyze breaks the logic.

Question 33Six Sigma Fundamentals and DMAIC

A team maps a process and finds steps that add no value to the customer and could be removed. In lean Six Sigma terminology, these steps are best described as:

  1. Critical-to-quality characteristics
  2. Control plan checkpoints
  3. Non-value-added waste Correct answer.
  4. Special causes of variation

Explanation

Waste is any activity consuming resources without creating value for the customer, and lean identifies categories such as overproduction, waiting, transport, overprocessing, inventory, motion and defects. Value-added work is what the customer would pay for.

Question 34Six Sigma Fundamentals and DMAIC

Which metric is a classic Six Sigma measure of process capability that compares specification width with process spread?

  1. Defects per million opportunities
  2. Rolled throughput yield
  3. Takt time
  4. Cp Correct answer.

Explanation

Cp equals the specification width divided by six standard deviations, expressing potential capability relative to process spread. It ignores centering, which is why Cpk is also used to account for how far the mean sits from the specification target.

Question 35Six Sigma Fundamentals and DMAIC

In a SIPOC diagram, what does the "O" represent?

  1. Objectives of the project
  2. Outputs delivered to the customer Correct answer.
  3. Owners of the process
  4. Opportunities for defect counting

Explanation

SIPOC stands for Suppliers, Inputs, Process, Outputs, Customers, so the O is the outputs the process delivers to its customers. The diagram is a high-level scoping tool used early in Define to agree on process boundaries.

Question 36Six Sigma Fundamentals and DMAIC

A Belt wants to confirm that repeated measurements of the same part by the same appraiser produce consistent results. Which study addresses this?

  1. Gage repeatability and reproducibility study Correct answer.
  2. Design of experiments
  3. Value stream map
  4. Failure mode and effects analysis

Explanation

A gage R&R study partitions measurement variation into repeatability, the equipment's consistency on repeated readings, and reproducibility, the variation between appraisers. It is performed in Measure to validate the measurement system before relying on the data.

Question 37Six Sigma Fundamentals and DMAIC

What is the primary purpose of a control chart in the Control phase?

  1. To rank potential failure modes by risk priority number
  2. To distinguish common-cause variation from special-cause variation over time Correct answer.
  3. To calculate the cost of poor quality for the business case
  4. To select the statistically significant factors from a screening experiment

Explanation

Control charts plot a process statistic over time against statistically derived limits so the team can tell routine common-cause variation from signals of a special cause. Reacting only to special-cause signals prevents tampering with a stable process.

Question 38Six Sigma Fundamentals and DMAIC

Which statement best describes the role of the voice of the customer in Define?

  1. It assigns the risk priority number to each failure mode
  2. It determines the statistical control limits used in the Control phase
  3. It translates customer needs into measurable critical-to-quality requirements Correct answer.
  4. It specifies the sample size required for a gage R&R study

Explanation

Voice of the customer data is collected and translated into critical-to-quality characteristics that are measurable and traceable to specifications. These CTQs anchor the problem statement and later capability measures.

Question 39Six Sigma Fundamentals and DMAIC

A Belt computes a process capability index Cpk of 0.85 for a CTQ with a two-sided specification. What does this value most directly indicate?

  1. The process spread relative to specification is such that the process is not capable and is off-center Correct answer.
  2. The process is centered exactly on the target with minimal variation
  3. The measurement system is unacceptable and must be replaced
  4. The process is in statistical control with no special causes

Explanation

Cpk below roughly 1.0 signals that the specification limits fall within about three standard deviations of the mean, so the process produces appreciable defects. Because Cpk accounts for centering, a low value also suggests the mean is displaced from the target.

Question 40Six Sigma Fundamentals and DMAIC

A team plots baseline data and observes points beyond the control limits plus a run of nine points on one side of the centerline. What is the most appropriate interpretation?

  1. The control limits are miscalculated because runs cannot occur in real data
  2. The process shows special-cause signals and should be investigated before capability is assessed Correct answer.
  3. The process is stable and capability can be reported immediately
  4. The data should be discarded as outliers without further study

Explanation

Points beyond the limits and long runs on one side of the centerline are recognized special-cause patterns. Capability indices computed on an unstable process are unreliable because the variation is not from a constant system of causes.

Question 41Six Sigma Fundamentals and DMAIC

In the Analyze phase, a Belt tests whether the mean fill volume differs between three filling machines. Which technique is most appropriate?

  1. One-way analysis of variance Correct answer.
  2. Simple linear regression
  3. Gage reproducibility study
  4. Chi-square test of independence

Explanation

Comparing means of a continuous response across three or more categorical levels calls for one-way ANOVA, which tests the equality of group means. Regression suits continuous predictors, chi-square suits categorical data, and a gage study quantifies measurement variation.

Question 42Six Sigma Fundamentals and DMAIC

A Belt runs a hypothesis test and obtains a p-value of 0.03 against a significance level of 0.05. What is the correct conclusion?

  1. Reject the null hypothesis and treat the effect as statistically significant Correct answer.
  2. Conclude the effect size is large enough to be practically important
  3. Conclude the test is invalid because the p-value exceeds 0.01
  4. Accept the null hypothesis because the p-value is small

Explanation

When the p-value is below the chosen alpha, the observed result is unlikely under the null hypothesis, so the null is rejected. Statistical significance does not by itself establish practical importance, which requires an effect-size judgment.

Question 43Six Sigma Fundamentals and DMAIC

Which tool is used in Analyze to organize potential causes into categories such as Man, Machine, Material and Method?

  1. Process behavior chart
  2. Cause-and-effect diagram Correct answer.
  3. Control plan
  4. Pareto chart of defect counts

Explanation

The cause-and-effect, or fishbone, diagram branches potential causes by category to structure brainstorming before data confirms which causes matter. It generates hypotheses; it does not by itself prove causation.

Question 44Six Sigma Fundamentals and DMAIC

A Belt constructs a Pareto chart of complaint reasons and finds that two categories account for about 80 percent of complaints. What action does this most directly support?

  1. Conclude that the process is out of statistical control
  2. Replace the measurement system before any improvement
  3. Focus improvement effort on the vital few categories driving most complaints Correct answer.
  4. Eliminate all complaint categories simultaneously for fairness

Explanation

The Pareto principle directs attention to the relatively few categories producing most of the effect, so effort yields the greatest return. Prioritizing the vital few is a standard Analyze and Improve decision.

Question 45Six Sigma Fundamentals and DMAIC

In a designed experiment, why is randomization of run order important?

  1. It ensures the measurement system has adequate resolution
  2. It eliminates the need for replication or blocking
  3. It spreads the influence of nuisance variables evenly so they do not bias factor effect estimates Correct answer.
  4. It guarantees the response will meet specification limits

Explanation

Randomizing the order of runs protects against confounding of treatment effects with time-related nuisance factors such as drift or warm-up. It does not remove variation, but it prevents systematic bias from being attributed to a factor.

Question 46Six Sigma Fundamentals and DMAIC

A project goal states: "Reduce invoice processing cycle time from a median of 6.2 days to 3.0 days within four months without increasing error rate." Which characteristic makes this a well-formed goal statement?

  1. It names the statistical test that will be used in Analyze
  2. It assigns blame to the department causing the delay
  3. It lists the root causes the team expects to find
  4. It specifies a measurable baseline, a target, a timeframe and a constraint Correct answer.

Explanation

A strong goal statement is specific and measurable, includes a baseline and target, states a deadline, and notes constraints or boundaries. This wording satisfies those criteria and keeps scope bounded.

Question 47Six Sigma Fundamentals and DMAIC

During Improve, a team pilots a new workflow on one shift before full deployment. Which benefit does a pilot provide?

  1. It tests the change under controlled conditions and surfaces problems before wider rollout Correct answer.
  2. It proves statistical significance of the root cause
  3. It replaces the need for a control plan after implementation
  4. It eliminates the need to re-measure the process after the change

Explanation

A pilot limits exposure while validating that the proposed change actually improves the CTQ and that the process can operate it reliably. Lessons from the pilot inform full-scale implementation and the control plan.

Question 48Six Sigma Fundamentals and DMAIC

What is the purpose of a failure mode and effects analysis in a Six Sigma project?

  1. To translate customer requirements into a control chart
  2. To determine whether the process is in statistical control
  3. To rank potential failure modes by severity, occurrence and detection so preventive actions can be prioritized Correct answer.
  4. To compute the process capability index before improvement

Explanation

FMEA systematically identifies ways a process or product can fail and scores each mode, often with a risk priority number, to prioritize mitigation. It is preventive risk analysis rather than a capability or control calculation.

Question 49Six Sigma Fundamentals and DMAIC

A Belt must decide between a variable control chart and an attribute control chart for monitoring a process. Which consideration drives the choice?

  1. Whether the process mean is greater than the standard deviation
  2. Whether the data were collected by an automated sensor
  3. Whether the monitored characteristic is measured on a continuous scale or counted as discrete conforming or nonconforming units Correct answer.
  4. Whether the sample size exceeds thirty observations

Explanation

Variable charts such as X-bar and R monitor continuous measurements and are more sensitive, while attribute charts such as p and c monitor counts of defective units or defects. The measurement scale of the characteristic determines which family applies.

Question 50Six Sigma Fundamentals and DMAIC

A Belt is told the process sigma level is 4.5. Approximately how many defects per million opportunities does this correspond to, using the conventional Six Sigma conversion table?

  1. About 233
  2. About 6,210
  3. About 66,800
  4. About 1,350 Correct answer.

Explanation

In the conventional Six Sigma table, a 4.5 sigma level corresponds to roughly 1,350 DPMO, reflecting the standard 1.5 sigma shift assumption. Each half-sigma step changes DPMO by orders of magnitude, so the table value must be read carefully.