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Unformatted text preview: PSYC 200 Statistical Methods in Psychology Lab 2 ee last time… Frequency and grouped distribution tables Depicting data Measure of central tendency •Mean •Median •Mode Shapes of curves •Symmetry •Modality •Skewness Measure of variability (spread) • Range • Deviation scores • Sums of squares • Population variance • Population standard deviation • Sample variance • Sample standard deviation Standard scores and distributions •Z ‐ scores Central tendency Variability Variability (Spread) ‐ the degree to which scores in a distribution are spread out or clustered together Range ‐ the distance between the largest score and the smallest score in the distribution Range = Range = Range = Deviation scores ‐ the distance between a given score and the mean Deviation score = x x i − min max x x − 1 x x min max + − min lrl max url x x − Mean deviation ‐ the average absolute deviation score Mean deviation = Sums of Squares ‐ the sum of the squared deviations around the mean n x x i ∑ − ( ) ∑ − = 2 x x ss ( ) n x x ss 2 2 ∑ ∑ − = Variance...
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This note was uploaded on 02/26/2012 for the course PSYC 200 taught by Professor Staff during the Spring '08 term at Maryland.
 Spring '08
 staff
 Psychology

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