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Lecture 5.Experimental Method 1

Lecture 5.Experimental Method 1 - The Experimental Method...

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5/20/13 1 The Experimental Method Cozby & Rawn Chapter 4 (pgs 78 – 89) Stanovich Chapter 6 How do you find my lecture speed? a) Way too fast b) A little fast c) Good d) A little slow e) Way too slow Using the correlational method we can a) Determine causation b) Assess the strength of relationship between variables c) Assess the direction of relationship between variables (e.g., positive or negative relationship) d) B and C e) All of the above
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5/20/13 2 Why can’t we infer causation based on correlation? a) Because a correlation precludes the possibility of a causal relationship (if we find a correlation it means that it is not possible that one variable causes another) b) Because of the directionality problem c) Because of the third variable problem d) B and C e) All of the above Recall: The correlational method does not permit us to determine causation Goal of Experimental Method – to establish the existence of causal relationships between variables Independent Variable – the variable that is manipulated to observe its effect on the dependent variable The variable believed to be the cause of change in the dependent variable Dependent Variable – the variable that is measured to determine the effects of the independent variable The variable believed to be affected by the independent variable
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5/20/13 3 Dr. deSade is interested in whether stress influences
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