Practice Quiz

Six Sigma Green Belt

Category - Black Belt

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Jamieson Inc. produces self-cleaning commercial ovens. In the testing phase of this capability, 20 tests were conducted on the prototype and the results show that 10 consecutive results show process variability that is below the given mean. Is this process in-control or out-of-control?
  1. in-control but for this initial testing phase
  2. in-control
  3. out-of-control
  4. not enough information available
Explanation
Answer: C - This process is out-of-control.

Key Takeaway: A process is said to be out-of-control 8 or more data points lie consecutively on one side of the mean in the control chart. A process is also said to be out-of-control if one or more points fall outside the control limits (i.e. above the UCL or below the LCL).
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