Research method in which an investigator manipulates one or more factors to observe the effect on some behavior or mental process.
Evaluating Therapies
New drugs and treatments need to be evaluated to see if they truly work.
Regulations to Evaluate the Treatment
Several procedures to help the experiment be reliable.
Blind/Double Blind Procedure
Where either the experimenter or the participant (or both) do not know which group is receiving a placebo or the actual treatment.
An inert substance assumed to be an active agent taken by a control group to test if results are caused by expectations.
Experimental Condition
Condition of an experiment that exposes participants to the treatment.
Control Condition
Contrasts the experimental condition and serves as a comparison for evaluating the effect of a treatment.
Random Assignment
Participants from a population are randomly assigned to a group (control or experimental)to minimize preexisting differences between groups.
Independent Variable
Experimental factor being manipulated.
Dependent Variable
Experimental factor being measured.
Example: Subliminal Tapes
Can Subliminal Tapes Improve Your Life? A stimulus too weak to recognize can affect us, briefly, under certain circumstances.
Effectiveness of Subliminal Tapes
The general public is unaware of the importance of controlled experiments
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