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Scales of Measurement

  • Before we can perform any statistical procedure, we must first measure something.
  • Measurement scales can contain the following properties:
    • Magnitude – the ability to know if one score is greater than, less than, or equal to another score.
    • Equal Intervals – the magnitude is represented by a unit of measurement that is the same no matter where it falls on the scale.
    • Absolute Zero – the scale has a point that is equal to zero or a point where there is no score