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  • The purpose of collecting data is to make predictions
  • Since all decisions are predictions, data is needed for decision making
  • Measurements and measurement methods, must be defined and agreed upon
  • The accuracy, repeatability and precision of measurements must be estimated
  • Graphs provide more information than tables
  • Data displayed in time sequence provide context
  • All data has noise associated with it
  • Improvement strategies are dependent on the type of variation encountered in the data.

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