Examlex
The Carnegie Corporation evaluated U.S.middle schools and recommended that:
Operational Definitions
Observable operations, procedures, and measurements that are based on the independent and dependent variables.
Internal Validity
The extent to which a study can demonstrate a causal relationship between variables, minimizing the influence of external factors.
Independent Variable
A variable that is manipulated or changed in an experiment to observe its effects on a dependent variable.
Dependent Variable
In experimental research, the variable that is observed and measured to determine the effect of the independent variable, reflecting outcomes or changes.
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