25: Assessing Variance 2: Range, Interquartile Range


Assessing Variance 2

  • Range
      • Difference between the highest and lowest score in a distribution (often one is added to the result)
      • Rarely used because it only considers on the extreme score on either end and ignores the scores in the middle
      • Can be helpful for distributions with low variance that have no or very little skew

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    • Interquartile Range
        • The difference between the middle 50 percent of scores
        • More useful than the range because it eliminates extreme scores on both ends of the distribution

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