Practice Quiz

Lean Bronze

Category - Continuous Improvement

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Which of the following would lead a project team to determine a process was out of control?
  1. Zero single points are outside the upper control limits.
  2. At the fourth point, when two out of three successive points are on the same side of the centerline and farther than 2 σ from it.
  3. Six out of the last eight points plot on the same side of the center line.
  4. A run of four in a row are on the same side of the centerline.
Explanation
Answer: B - A project team would determine a process was out of control at the fourth point when two out of three successive points are on the same side of the centerline and farther than 2 σ from it. Sigma levels 1, 2, and 3 are used to determine unstable conditions. An unstable process is out of statistical control and shows variation due to special cause variation. An unstable, out of control condition can be a point, set of points, or trend in the data.
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