1-14-ResearchMethods-NeuralComm

1-14-ResearchMethods-NeuralComm - Scientific Method...

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1 Scientific Method & Behavioral Research A B C Scientific Method & Behavioral Research Empirical Research –Experimental Research Correlational Research –Case Studies • Evaluating Research Correlational Research Correlational Study : Researchers seek to describe relationships that exist between variables without directly manipulating the variables in question
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2 Correlation Correlation: statistical measure of the degree of relationship between two variables – Measured using the correlation coefficient (r) – Ranges from -1.0 (inversely related) to +1.0 (directly related) Correlation Positive Correlation : increase in X leads to increase in Y. ( r = +1.0 if relationship is perfectly linear) Zero Correlation: X and Y bear no relationship ( r=0.0 if there is absolutely no relationship Negative Correlation : Increase in X leads to decrease in Y. ( r=-1.0 if this relationship is perfectly linear) Correlation Positive Correlation : increase in X leads to increase in Y. ( r = +1.0 if relationship is perfectly linear) Zero Correlation: X and Y bear no relationship ( r=0.0 if there is absolutely no relationship Negative Correlation : Increase in X leads to decrease in Y. ( r=-1.0 if this relationship is perfectly linear)
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• Correlational research CANNOT directly assess causality Causal Ambiguity – The direction of causation may be ambiguous • Poverty and schizophrenia are highly correlated • Does poverty cause schizophrenia or vice versa? • Poverty bB Schizophrenia Third-Variable Problem – A third, unmeasured, variable may be responsible for the correlation between the two measured variables Scientific Method & Behavioral Research Empirical Research –Experimental Research –Correlational Research Case Studies • Evaluating Research Case Studies • Researchers observe and describe an individual in great detail Patient H.M. Genie
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1-14-ResearchMethods-NeuralComm - Scientific Method...

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