Phil12_S11_Predicting_from_correlations(5-3-2011)

Phil12_S11_Predicting_from_correlations(5-3-2011) -...

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Predicting from correlations Phil 12: Logic and Decision Making Spring 2011 UC San Diego 5/3/2011 Tuesday, May 3, 2011

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Paper 1 Due by 11am Thursday May 12th - late penalty: 1 full letter grade per day late Will post instructions (with topics) on course website, send out email via Tritonlink - 1-2 pages (2 pages max) - Must write about topic for your section 2 Tuesday, May 3, 2011
Review - 1 Correlations: relations between variables - May or may not be causal - Enable prediction of value of one variable from value of another To test correlational (and causal) claims, need to make predictions that are testable - Operationally “deFne” terms - Construct validity Tuesday, May 3, 2011

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Construct validity http://news.sciencemag.org/sciencenow/2011/04/what-does-iq-really-measure.html?ref=hp Tuesday, May 3, 2011
No correlation Negative correlation Nonlinear correlation Positive correlation Tuesday, May 3, 2011

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Measuring correlation Karl Pearson developed a measure of correlation, known as Pearson’s Product Moment Correlation (r) -1.0 1.0 0 Perfect negative correlation No correlation Perfect positive correlation Tuesday, May 3, 2011
Measuring correlation Very rough guidelines: Value of r Strength of relationship 0 no correlation -0.25 to 0 0 to 0.25 weak -0.5 to -0.25 0.25 to 0.5 moderate -1 to -0.5 0.5 to 1 strong Tuesday, May 3, 2011

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Pearson Correlation CoefFcient Pearson’s Product Moment Correlation r = .857 - Notable features: Positive value: as spelling score increases, math score tends to increase as well Very high: correlation strong (as opposed to moderate or weak) - Therefore: Strong positive correlation between spelling scores and math scores Participant 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Spelling 15 14 15 12 6 4 8 9 9 12 18 13 10 10 11 Math 12 17 17 12 8 5 10 9 8 14 16 14 10 13 15 Tuesday, May 3, 2011
A. GPA and time spent studying are unrelated to one another B. As time spent studying increases so does GPA; the correlation is weak in strength C. As time spent studying increases so does GPA; the correlation is moderate in strength D. As time spent studying increases, GPA decreases; the correlation is weak in strength E. As time spent studying increases, GPA decreases; the correlation is moderate in strength A study was conducted of the relationship between time spent studying and GPA, reporting a correlation of r = 0.37. Which of the following characterizes the relationship between

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This note was uploaded on 06/07/2011 for the course PHIL 101 taught by Professor Brown during the Spring '08 term at San Diego.

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Phil12_S11_Predicting_from_correlations(5-3-2011) -...

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