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Chapter 4

Ch. 4 - Variability.docx

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PSYC 2530
Anne Russon

Ch. 4 - Variability Sunday, November 11, 2012 5:51 PM PSYC 2530 Introductory Statistics Chapter 4: Variability  Diversity = differences from person to person  Consistency = differences in scores for the same person  Variability provides a quantitative measure of the differences between scores in a distribution and describes the degree to which the scores are spread out or clustered together. o Serves two purposes:  Describes the distribution in terms of distance between scores  Measures how well an individual score represents the entire distribution  The range is the distance covered by the scores in the distribution, from the smallest score to the largest score o Continuous variables = URL for Xmax - LRL for Xmin o Discrete variables = Xmax - Xmin + 1  Deviation is distance from the mean: o deviation score = X - μ  Two parts, sign (+ or -) and the number  Population variance equals the mean squared deviation. Variance is the average squared distance from the mean. o o Standard deviation is the squar
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