PSY 2311st Edition Lecture 9 Outline of Last Lecture I. Autism Movie NotesOutline of Current Lecture II. Designs With One IVIII. Multiple IV Designsa. Structureb. Results:Main Effectsc. Results: Interaction EffectsCurrent LectureDesigns With One IV● 2 ways to structure an experiment● Between Groups Design-- compare different groups of participants, treated differently atthe 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” effectsStructure● Manipulate two + IV’s○ two or more levels of each IV○ EX.Studying Fatigueyes restedno tiredResults:Main Effects● Main effects-- overall effect of one IV -- ignoring (averaged across) levels of any other IV’s○ EX: studying raises test scoresResults:Interaction Effects● Interaction effect--an it “it depends” answer to the research question○ one IV’s effect depends on the level of another
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