25: Assessing Variance 2: Range, Interquartile Range
Assessing Variance 2
- Range
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- 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
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- 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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