May 14 - May 14, 2009 Experimental Research (Continued)...

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May 14, 2009 Experimental Research (Continued) Random Assignment of participants to conditions o Everyone must have an equal chance of ending up in either condition o Why important? Makes groups equal before manipulation (same personalities, backgrounds, etc.) Types of Experimental Designs: o Design notation: X = Manipulation/treatment of IV (what you are doing to people) O = Observation (measure for DV) R = Random assignment True (full) Experiments: o Posttest only (control group) design R X O (group 1) R O (group 2) control group (ex. Placebo) Ex: Effects of antismoking ad R X (antismoking ad) O (beliefs about smoking) R no smoking ad O (beliefs about smoking) Variations: more groups, several different treatments o Pretest – Posttest (control group) design R O X O (group 1) R O O (group 2) Possible problem: interaction of manipulation with pretest Solution: add in diversion questions o Solomon four-group design:
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This note was uploaded on 11/07/2010 for the course COMM COMM88 taught by Professor Dorothymullin during the Spring '09 term at UCSB.

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May 14 - May 14, 2009 Experimental Research (Continued)...

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