8-3 - 8-3 Statistics: Range and Standard Deviation...

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8-3 Statistics: Range and Standard Deviation statisticians need to know what the central tendency of a set of scores is: mean, median they also want to know how “spread out” the scores are statistics that measure the spread are called measures of dispersion R ANGE The range of a set of scores is the distance from lowest to highest score: range = (high score – low score) S TANDARD D EVIATION the most commonly used measure of dispersion notation (for the whole population):
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8-3 - 8-3 Statistics: Range and Standard Deviation...

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