Examlex
UNICEF was first established to help ______________.
Random Assignment
The allocation of study participants to different groups by chance, minimizing pre-existing differences between those groups.
True Experiments
A type of scientific experiment where the researcher manipulates one variable, and controls/randomizes the rest of the variables.
Construct Validity
The degree to which a test or instrument accurately measures the theoretical construct it is intended to measure.
One-group Pretest-posttest Design
An experimental design where a single group is measured both before and after a treatment, assessing the treatment's impact.
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