Improve Phase and Solutions Flashcards
7 cards from real Lean Six Sigma Green Belt Certification practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Improve Phase and Solutions flashcards as text
What does 'takt time' represent in a lean production environment?
Answer: The available production time divided by customer demand rate
Takt time = available production time ÷ customer demand rate, setting the rhythm at which products must be completed to meet demand.
In a DOE, a 'main effect' refers to:
Answer: The average change in the response caused by changing one factor from low to high
A main effect is the average change in the response variable when a single factor moves from its low level to its high level, averaged across all levels of other factors.
Which lean concept describes the continuous flow of a single unit through a process without batching?
Answer: One-piece flow
One-piece flow moves individual units through each process step immediately, eliminating batching and reducing WIP and lead time.
A team is choosing between two solutions. Solution A has a high impact but high risk; Solution B has moderate impact and low risk. Which tool helps formally evaluate this trade-off?
Answer: Risk-benefit matrix
A risk-benefit (or impact-effort) matrix plots solutions by their risk/cost versus their expected benefit to support structured decision-making.
In a simulation model used for process improvement, 'Monte Carlo simulation' is useful for:
Answer: Estimating the distribution of outcomes by randomly sampling input variables
Monte Carlo simulation repeatedly samples from input probability distributions to generate a distribution of possible output values, modeling process uncertainty.
Which type of kanban signals that a work center needs more materials from an upstream supplier or process?
Answer: Withdrawal (move) kanban
A withdrawal (or move) kanban authorizes the movement of a specific quantity of material from an upstream store to a downstream process.
After implementing a process change, a team runs a two-sample t-test and obtains a p-value of 0.03. At α = 0.05, what should they conclude?
Answer: Reject the null hypothesis; there is a statistically significant difference
Since p-value (0.03) < α (0.05), the team rejects the null hypothesis, concluding there is a statistically significant difference between before and after.