Lecture 3- student

Lecture 3- student - ResearchMethodsin ResearchMethodsin...

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Research Methods in  Research Methods in  Psychology Psychology EXPERIMENTAL METHODS: Repeated Measures Designs September 21, 2009
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Agenda: Agenda: Quiz  Review of last class Lecture Chapter 7: Independent Groups Designs Break  Lecture Chapter 8: Repeated Measures Designs
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Review:  Review:  Group activity discussion  Ethics outline
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Chapter 7:  Chapter 7:  Independent Groups Designs Independent Groups Designs “The experimental method is the best  available research method for identifying  causal relationships between variables.” - Shaughnessy et. al.
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Why the experimental method? Why the experimental method? Goals: To test hypotheses derived from theories To test the effectiveness of a treatment or  program Explanation (causes of behavior)
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Logic of experimental research: Logic of experimental research: An experiment must include: Independent variable (IV) Dependent variable (DV) Causal Inference
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Independent Groups Designs: Independent Groups Designs: Different individuals participate in each  condition of the experiment (i.e., each  participant participates in only one  condition) Three types: 1. Random Groups Design 2. Matched Groups Design 3. Natural Groups Design
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Body Image Among Young Girls Dittmar, Halliwell, and Ive (2006)  (pp. 208-213 of text) Research Question : Does exposure to very thin  body images cause young girls to experience  negative feelings about their own body? Independent Variable : Manipulated a version of a  picture book using three levels Barbie Emme Neutral
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Body Image Among Young Girls,  Body Image Among Young Girls,  continued continued Dependent Variables : Several to  operationally define “body image” Child Figure Rating Scale Hypothesis : Young girls who are exposed  to the very thin body image (Barbie) will  experience greater body dissatisfaction  than young girls who are exposed to  realistic body images or neutral images
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Internal Validity:  Internal Validity:  Definition: IV  caused  the observed differences  between groups on the DV (causal inference) Poor internal validity: Post-test design                                  X¹     O¹                      X²      O¹                       X³      O¹ One-group pretest-posttest design:                 O¹     X       O² Confoundings- eliminated through experimental  control
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Experimental Control: Experimental Control: Control = Techniques to eliminate  confoundings Manipulation Holding conditions constant Balancing Random assignment to conditions
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This note was uploaded on 04/18/2010 for the course PSYC 386 taught by Professor Conner during the Spring '10 term at Roosevelt.

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Lecture 3- student - ResearchMethodsin ResearchMethodsin...

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