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Unformatted text preview: Today *Admin *Review session tomorrow, 3-5 PM, here *Section A lab meets today *More on Experimental Design… *If time, APA Scramble Last Time *Cause and effect *IV and DV *Manipulating the IV *Experimental settings Control Example of Lack of Control *Example: A researcher tests whether overcrowding causes angry moods. *H 1 : Overcrowding makes people angry *H : Overcrowding does not make people angry Overcrowding à Angry Mood? *IV: Overcrowding *Three groups *Overcrowding : Completing questionnaires in room with 10 other people *Medium crowding : Completing questionnaires in room with 2 other people *No crowding : Completing questionnaires in room alone Overcrowding à Angry Mood? *DV: Angry moods *Behavioral coding of facial expressions of anger from videotapes as they completed the questionnaires Results Results Ways of achieving control *Control Techniques *Randomization *Matching *Careful design of the experiment *phase 2 of this course *Statistical adjustments *beyond the scope of this course Randomization *Random assignment *assigning participants at random to the experimental groups– every person has an equal chance of being assigned to each group *equates groups by randomly distributing the extraneous variables (e.g., age, IQ, race, sex, fights, ice cream) over the treatment groups *extraneous variable: any variable other than the IV that influences the DV;...
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This note was uploaded on 03/26/2008 for the course PSYCH 31 taught by Professor Dicorcia during the Spring '08 term at Tufts.
- Spring '08
- Experimental Psychology