ISU PSY 231 - Choosing an Experimental Design (2 pages)

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Choosing an Experimental Design



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Choosing an Experimental Design

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A discussion of different types of experimental designs.


Lecture number:
9
Pages:
2
Type:
Lecture Note
School:
Illinois State University
Course:
Psy 231 - Research Methods in Psychology
Edition:
1

Unformatted text preview:

PSY 231 1st Edition Lecture 9 Outline of Last Lecture I Autism Movie Notes Outline of Current Lecture II Designs With One IV III Multiple IV Designs a Structure b Results Main Effects c Results Interaction Effects Current Lecture Designs With One IV 2 ways to structure an experiment Between Groups Design compare different groups of participants treated differently at the same time Within Subject Design compare the same participants treating them differently at different times After only Design you don t know if the IV actually changed Inadequate Before After Design compares the IV before the experiment and again after to see if there was actually a change Within Subject Adequate Multiple IV Designs Factorial research designs manipulate two or more IV s simultaneously between groups or within subjects Search for it depends effects Structure Manipulate two IV s two or more levels of each IV EX Studying Fatigue yes rested no tired Results Main Effects Main effects overall effect of one IV ignoring averaged across levels of any other IV s EX studying raises test scores Results Interaction Effects Interaction effect an it it depends answer to the research question one IV s effect depends on the level of another IV



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