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Understanding z scores

Understanding z scores

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Understanding z scores

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  1. Understanding z scores

  2. Standard scores • Standard scores assume a normal distribution • They provide a method of expressing any score in a distribution in terms of its distance from the mean in standard deviation units

  3. Z-score • A raw score by itself is rather meaningless. • What gives the score meaning is its deviation from the mean • A Z score expresses this value in standard deviation units

  4. Z-score Raw score Mean Standard deviation

  5. Z score formula

  6. Z score computation