Examlex
Parametric statistics require that all data used be either interval or nominal.
Natural Groups
Groups that exist in the real world as they are, without manipulation or creation for research purposes, such as ethnic or gender groups.
Two Groups
A research design involving comparison between two separate groups of participants to determine the effect of a variable.
Experiment
A scientific procedure undertaken to make a discovery, test a hypothesis, or demonstrate a known fact.
History Effect
refers to the impact that events occurring between the first and second measurements in an experiment have on the subjects' performance, independent of the experimental manipulation.
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