Practice Quiz

Six Sigma Black Belt Exam Prep

Category - Black Belt

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A Black Belt practitioner constructs a control chart to display a process mean and its outer limits. In the chart above, what does LCL stand for?
  1. lower cycle length
  2. lower control limit
  3. lower cycle limit
  4. lower control length
Explanation
Answer: B - LCL stands for Lower Control Limit

Key Takeaway: Lower Control Limits (LCL) are calculated as three standard deviations below the mean of a process. For example, if a single production cycle takes an average of 53 minutes, an LCL can be calculated using this mean and standard deviation. An LCL is useful in setting limits to product quality so that they continue to fulfill client requirements despite variations around the mean of the process.
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