Complex_designs_-_notes_version - 8/21/2010 Complex designs...

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8/21/2010 1 Complex designs Complex designs - jargon Just complicated experiments – with new terms Experiment: Randomly assign subjects to drink coffee or drink decaf Factor(s) - another term for independent variable Level(s) – different conditions within a factor Experiment with a 3 rd group: drink caffeinated soda One-factor designs with >2 levels Two reasons for these designs: May want multiple control groups/be interested in multiple conditions Need more than two levels to detect curvilinear or complex relationships between variables Yerkes-Dodson Law 12 3 Bandura study of ‘Imitative Aggression’ Children (3-5 yrs) assigned to 1 of 3 conditions: Observe aggressive adult beat up Bobo doll Observe nonaggressive adult not beat up Bobo doll No exposure to any adult model Matched Pairs Design: Children were enrolled in Stanford University’s Nursery School Rated by teachers for degree of aggressiveness Matched for aggressiveness before being randomly assigned to conditions Predictions: (1) Kids exposed to aggressive models would show more aggression (2) Exposure to nonaggressive model would inhibit aggression
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8/21/2010 2 Bandura study of ‘Imitative Aggression’ Kids were not sufficiently aggressive without some provocation: Experimenter brought kids into room with attractive toys and after letting them get engaged with them (~ 2 min.), “remarked that these were her very best toys, that she did not let just anyone play with them, and that she had decided to reserve these toys for the other children.” Observers counted number of aggressive acts in specific categories over 20 minute period Concealed behind one-way mirror Results 20 25 ve acts Imitative Aggression Aggressive 0 5 10 15 # of imitated aggressiv condition Nonaggressive control Bandura, Ross, & Ross, 1961 (Full) factorial designs Factorial designs involve > 1 independent variable or “factor” All levels of each independent variable are combined with all levels of the other independent variables Each combination produces a ‘cell’ in which different
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This note was uploaded on 12/18/2010 for the course PSY 7 taught by Professor Sherman during the Summer '09 term at UCSB.

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Complex_designs_-_notes_version - 8/21/2010 Complex designs...

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