Examlex
According to Kepler, the line from the Sun to any planet sweeps out equal areas of space
Nonequivalent Groups
In quasi-experimental designs, groups of participants that are compared but are not identical in terms of key characteristics because of the lack of random assignment.
Natural Groups
Groups that exist organically or naturally in a research study, not formed by the experimenter; often used in observational studies.
Existing
The state or fact of being present or having an actual being; to have life or reality.
Many Independent Variables
Refers to experimental designs that include multiple factors being manipulated to observe their effect on a dependent variable.
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