Lectures+6+_+7-+Normal+Curve-post

Lectures+6+_+7-+Normal+Curve-post - Chapter 5: Normal Curve...

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Click to edit Master subtitle style 8/12/10 Chapter 5: Normal Curve September 9-11, 2008
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8/12/10 Why should we care? Distribution of most variables we measure: Intelligence Achievement Positive Affectivity Personality Variables Assumption of many inference tests
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8/12/10 Y= “frequency” of X X= score μ = mean of the distribution The normal curve
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8/12/10 E.g., IQ scores SAT μ = 100 Area contained under the curve IQ 52 68 84 100 116 132 148
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8/12/10 Standard Scores z scores A z score is a transformed score that designates how many standard deviation units the corresponding score is above or below the mean mean = 0 standard deviation = 1 Raw scores do NOT s X X z X z - = - = σ μ
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8/12/10 In which class are you doing better? Social Psychology You got an 87! mean= 80 sd =5 Abnormal Psychology You got a 92! mean = 75 sd = 15
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Determine the z score for
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This note was uploaded on 08/11/2010 for the course CSCI N207 taught by Professor Staff during the Fall '08 term at IUPUI.

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Lectures+6+_+7-+Normal+Curve-post - Chapter 5: Normal Curve...

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