Chapter 5: Measures of Variability. The Importance of Measuring Variability The Range IQR (Inter-Quartile Range) Variance Standard Deviation Considerations for choosing a measure of variation. The Importance of Measuring Variability.
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These two types of measures together help us to sum up a distribution of scores without looking at each and every score. Measures of central tendency tell you about typical (or central) scores. Measures of variation reveal how far from the typical or central score that the distribution tends to vary.
Range = highest score - lowest score
These values fall together closely
Shows greater variability
Importance of the IQR
Yet the ranges are equal!