Examlex
Which of the following is an excitatory neurotransmitter?
Control Groups
Groups in experiments that do not receive the experimental treatment, allowing researchers to assess the treatment's effect by comparing it against this baseline.
Experimental Groups
Groups in an experiment that receive the treatment or variable being tested, allowing researchers to assess its effects.
Representative Sample
A part of a population that accurately represents the entire group's composition.
Observer Effect
The phenomenon where the act of observation alters the behavior of the observed subject or the outcome of an experiment.
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