class5_method2 - Introduction to Psychology Class 5 The...

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Introduction to Psychology Class 5: The Scientific Method 2 June 19, 2006
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Measures of Central Tendency Consider this sample: 3 3 5 6 7 2 8 9 5 5 3 30 Mean = 86/12 = 7.17 Mode = 3 and 5 (bimodal) Median = (5 + 5)/2 = 5 Outlier
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Correlation Answers the question: what is the linear relationship between two variables Consider amount of coffee and performance on an exam in a sample of coffee drinkers as an example Number of cups Exam score 1.0 90 1.5 89 2.0 95 2.5 95 3.0 99
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Graph Score as a function of amount of coffee 88 90 92 94 96 98 100 0 0.5 1 1.5 2 2.5 3 3.5 Cups of coffee Score on exam The Correlation between Performance and Amount of Coffee r = +.92
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NUMBER VALUE : 0 to 1 and SIGN : + or – r = + 1.0 r = + .89 r = + .63 r = + .28 r = ~ 0 r = - .91
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Limitations Coffee Score 1 90 1.5 89 2 95 2.5 95 3 99 3.5 93 4 91 4.5 89 5 89 The Correlation between Performance and Amount of Coffee 88 90 92 94 96 98 100 0 1 2 3 4 5 6 Cups of coffee Exam score r = - . 18 Works for LINEAR relationships only.
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COFFEE SCORE EXPECTATION Correlation is NOT causation.
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class5_method2 - Introduction to Psychology Class 5 The...

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