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The IQR overcomes this limitation of the range and instead is a measure of the range that encompasses the middle 50% of the distribution

Ignores the bottom 25% of scores and the top 25% of scores (ignores extreme scores)

More stable measure of variability - useful when you have extreme scores

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•Range
•Interquartile range •Variance and standard deviation

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The distance between the largest and the smallest score

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sum of all.

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- The overall sum of scores for the combined group

- The total number of scores in the combined group

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a number describing the sample

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a number describing the population

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Total pop. in study

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Sample of pop.

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Average number

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Middle number of distribution

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Most occuring

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Mean