Question: Why is the IQR better than the range as a measure of variability, especially when there are extreme scores in the distribution? To answer this

Why is the IQR better than the range as a measure of variability, especially when there are extreme scores in the distribution? To answer this question, you may want to examine Figure 4.3.

Group 1: IQR 1-3 Group 2: IQR 1-6 Number of Children Less

Group 1: IQR 1-3 Group 2: IQR 1-6 Number of Children Less Variable More Variable 0 Q. 1 2 000 Q. 3 4 5 6 7 8 9 10 20 Range = 10 Range = 10 Interquartile range = 2 Interquartile range = 5

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