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Ebbinghaus' retention curve best illustrates the value of
Placebo
A substance with no therapeutic effect, used as a control in testing new drugs.
Randomization
is a process of randomly assigning subjects to different groups in an experiment to ensure that each group is similar and that the results are not biased.
Cause-And-Effect
The relationship between events where one or more are the result of the other(s), often used in scientific and philosophical contexts to explain causality.
Experimental Conditions
The controlled environments or variables manipulated by researchers to study their effects on the outcomes of experiments.
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