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Lecture 2 - Why Study Research Methods Become a better...

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Research Methods PSY 12000: Fall 2011 Purdue University Dr. Eric D. Wesselmann 1 Why Study Research Methods? Become a better consumer of research Advertisements Political Campaigns News Reports 2 3 Research Methods Combines logical analysis and observation Involves several steps The Scientific Method 4
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Ask Research Question Specify Hypotheses Collect Data -- How? Analyze Data -- How? Interpret Findings Distribute Findings 5 Research Methods Formulate a question/problem, pitfalls : – Unobservable, e.g., “Are there ghosts?” – Vague, “How does the mind work?” – Unclear terms, “Can cats reason? Sample testable question: Gender differences in aggression? 6 Research Methods Formulate a question/problem State a hypothesis – Operational definitions – Nature of relationship between variables 7 Research Methods Formulate a question/problem State a hypothesis Develop design and procedure – Do an experiment, survey, or interview; use existing data; examine newspapers 8
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Research Methods Formulate a question/problem State a hypothesis Develop design and procedure Get data – Administer measures, scales, or procedures to get at variables 9 Basic Terms to Know Independent Variable (IV) Dependent Variable (DV) Main Effect Interaction Effect Hypothesis 10 Basic Terms to Know Correlation Correlation Range Correlation Strength 11 Correlation= .68 More positive attitude towards health behaviors Engage in more healthy behaviors 12
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Correlation= -.03 More positive attitude towards health behaviors Engage in more healthy behavior (less fast food) 13 How Do We Do Research in Psychology? Two General Categories of Studies – Correlational Designs – Experimental Designs 14 Correlation Detecting natural associations – Survey Questionnaires Interviews – Diary Studies 15 Correlation Limitations of Correlational and Survey
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