11 - 10/7/11 Control Any means used to rule out threats to...

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10/7/11 Control Any means used to rule out threats to the internal validity of research A standard against which to compare the effect of a particular variable (e.g., control group) The ability to restrain or guide sources of variability in research (experimental control) 2 Primary Study Designs Between-subject design o Control group – receives a zero level of the IV o Experimental group – receives a non-zero level of the IV Within-subjects design o Control condition – zero level of the IV that all participants experience at some point Is a control group necessary? Not always… Control groups are often necessary but sometimes they don’t really make sense Two forms of learning Two new drugs o May be considered unethical to have a no treatment condition Control Group/Condition: Standard for Comparison Method of Difference: if 2 individuals differ on only one variable then that variable may be considered to be the cause of the difference between the
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11 - 10/7/11 Control Any means used to rule out threats to...

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