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Six Sigma Green Belt Exam Prep

Category - Six Sigma Green Belt

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An ink manufacturing company manager draws a control chart that displays a process mean. The manager is concerned that the process of ink packages assembly is inconsistent and inefficient. The control chart below shows that the process is out of control because:
  1. eight points are above the center line
  2. process means are too close to the LCL
  3. process means are too far from the UCL
  4. one point is above the center line
Explanation
Answer: A - The process is out of control because eight points are above the center line.
Key Takeaway: A process is said to be out of control if eight or more points fall on one side of the process control chart center line. The center line is designed to measure the mean of a process. If a process capability study shows that eight or more points fall on one side of the center line, it indicates that the process has shifted in its performance and the underlying cause should be investigated.
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