Problem-Solving Tools - Histograms

 

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Histograms

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Histograms

What It Is Used For

  • To display variable data so that the pattern of variation can be identified.

When to Use It

  • To help determine if there are special causes of variation present in the process.
  • To compare the output of the process with customers’ specifications.

Important Notes

  • A nearly normal distribution is an indication that the process has mainly common cause variation present.
  • A bi-modal or multi-modal distribution is almost always a sign of a special cause of variation in the process or in the data collection technique.

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