Experimental group- group in an experiment that is exposed to the treatment<br />Control group- group in an experiment that is not exposed to the treatment <br />Groups<br />
Placebo- inactive substance<br />In order to test the effectiveness of a treatment, a placebo is used on the control group<br />Usually it will be a sugar pill<br />Placebo<br />
results controlled by expectations alone<br />In other words, sometimes a placebo is effective because the participants BELIEVE that they are really receiving the treatment <br />Placebo effect-<br />
Experiment: If employees are allowed to take a nap during lunch, will they be more productive in the afternoon?<br />Independent variables- the factor that is being manipulated, the variable whose effect is being studied<br />Ex: nap<br />Dependent variables- the factor that depends on the independent variable<br />Ex: productivity<br />Variables<br />
neither the participants or the researchers know who received the real treatment<br />Why would the double-blind procedure be more effective?<br />Double-blind procedure-<br />
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