Chapter 9_Correlational Research Designs.ppt

# Chapter 9_Correlational Research Designs.ppt -...

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Correlational Research Designs

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Correlational research Assessing the association between two or multiple variables Quantitative variables Nominal variables
Associations among quantitative variables 0 10 20 30 40 50 60 0 5 10 15 Frequency of use Impulsivity Scatter plot Regression line Linear positive relationship

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Associations between variables Direction Positive Negative
Associations between variables Strength Strong Moderate No relationship ( r = .90) ( r = .35) ( r = 0)

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Associations between variables Form Linear Curvilinear Independent ( r = .90) ( r = 0) ( r = 0)
The Pearson Correlation Coefficient Predictor variable Impulsivity (BIS) Non-planning Attention .25* .15 .24* .16* .28*** .11 Pearson product-moment correlation coefficient ( r ) linear relationships between quantitative variables -1≤ r ≥ + 1 *p < .05. ** p < .01. *** p < .001. r 2 – coefficient of determination (the proportion of variance) effect size = r restriction of range N, df .

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Association between nominal variable
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## This note was uploaded on 02/26/2011 for the course PSYC 420 taught by Professor Staff during the Fall '08 term at Maryland.

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Chapter 9_Correlational Research Designs.ppt -...

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