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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
  • 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