Lecture 2 - Behavioral Research methods Pt 3

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Unformatted text preview: me Statistics Statistics Mathematical tools Help us interpret data Can help to avoid bias Can also be misleading Measures of Central Tendency Measures of Ways to summarize a group of observations Mode – most frequently occurring score 1 Mean – mathematical average 5.2 Median – middle point 3 { 1 1 1 2 3 3 4 5 6 26 } Mean = (1+1+1+2+3+3+4+5+6+26)/10 = 5.2 Level of Shock Level of Shock Experimental group Control group Measures of Variation Measures of Range – difference between lowest and highest scores { 1 1 1 2 3 3 4 5 6 26 } 26 - 1 = 25 Standard deviation – measure of how much scores vary around the mean Average distance of the scores from the mean e.g.: How far is 1 from 5.2? How far is 2 from 5.2? Etc. Average of these answers (4.32) Level of Shock Level of Shock Very Little Overlap: Probably a real difference Experimental group Control group Level of Shock Level of Shock Great deal of Overlap: Probably not a real difference Outlier Experimental group Control group...
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