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Unformatted text preview: • Coefﬁcient of determination (r 2 ) 2 Differential Research • Rules of thumb: – Focus on comparing groups that differ on only one variable. – Use several comparisons when drawing conclusions about the role of a variable • Control and experimental groups • Sampling – Representitive sample – Random sample – Convenience sample • Analysis Limitations of Correlational & • Cannot draw causal inferences • Confounding variables...
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- Fall '09