Behavior & Statistics 5
Behavior & Statistics 5 Psychology 211
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This 1 page Class Notes was uploaded by Alexis Notetaker on Monday February 29, 2016. The Class Notes belongs to Psychology 211 at Southern Illinois University Carbondale taught by Zachary Pilot in Spring 2016. Since its upload, it has received 26 views. For similar materials see Behavioral Statistics in Psychlogy at Southern Illinois University Carbondale.
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Date Created: 02/29/16
Psy Notes 5 Monday, February 22, 201611:45 AM Central Tendency • Describes the central point Variability • Quantitative measure of difference between a set of scores • Describes how spread out the scores are in distribution ○ Provides a measure of how accurately any individual score or sample represents the entire population • Inferential Variability ○ Can be small or large Small □ One score/sample can fairly represent the population Large □ A few outliers may distort the picture of the general population ○ Inferential statistics are used to detect patterns and variability influences how easily they are detected Measures • Range ○ The total distance covered by the distribution, from highest to lowest score Range = max -min SD Calculation Summary • Mean = 600 + 470+ 170+430+300/5=1970/5=394 ○ Mean = 394 206^2=42436 -224^2=50176 76^2=5776 -94^=8836 36^2=1296 □ 42436+50176+5776+8836+1296=108520 108520/5=21704 So the variance is 21704 ◊ So square root 21704=14.32 ◊ So SD equals 147.32 Population data Formulas • Population ○ Variance = o = sqrt SS/N Unbiased and Biased Statistics • Unbiased ○ The average value is equal to the population parameter ○ Parameter Measure that describes a population • Biased ○ The average value overestimates or underestimates the corresponding population parameter
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