Randomized assignment

An experimental procedure in which all subjects in a study have an equal chance of being assigned to the two or more groups, that is, either the treatment, test, or experimental group , or the control or placebo group.

Random selection

A method of selecting things – events, objects, people, etc. – randomly from the larger population in which each individual has an equal chance of being selected.

(see also: selection bias, science, experimental research, control group, double-blind, experimenter bias, confound/confounding, variable, correlation)

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