4. Operations

Lean Six Sigma — Quiz

Test your understanding of lean six sigma with 5 practice questions.

Practice Questions

Question 1

A company is implementing a Lean Six Sigma project to reduce defects in its manufacturing process. They have collected data and determined that the current process has a mean of $250$ units per hour with a standard deviation of $5$ units. If the customer specifications require an output between $240$ and $260$ units per hour, what is the process capability index $\text{C}_p$?

Question 2

In a Lean Six Sigma project, a team is analyzing the root causes of customer dissatisfaction. They have identified several potential causes and want to visually represent their relative frequency to prioritize improvement efforts. Which of the following graphical tools would be most appropriate for this purpose?

Question 3

A supply chain manager is implementing a 'Just-In-Time' (JIT) system to minimize inventory and improve efficiency. Which of the following Lean principles is most directly aligned with the goals of a JIT system?

Question 4

A Lean Six Sigma team is in the 'Analyze' phase of a DMAIC project, investigating why a particular product line has a consistently high defect rate. They suspect that the defect rate might be influenced by the temperature of the manufacturing environment. Which statistical test would be most appropriate to determine if there is a significant correlation between temperature and the defect rate?

Question 5

In a Lean Six Sigma project, a process is found to have $3$ defects per $100,000$ opportunities. Assuming a $1.5\sigma$ shift, what is the approximate Sigma level of this process?