Examlex
Which of the following threatens the internal validity of an experiment?
Data Collection
The process of gathering and measuring information on variables of interest in a systematic fashion.
Random Assignment
A method used in experiments to assign subjects randomly to either the treatment or control group to eliminate bias.
Independent Variable
The factor in an experiment that is deliberately changed or manipulated to observe its effect on a dependent variable.
Equal Chance
A principle whereby each subject or experimental unit in a study has the same probability of being assigned to a particular group or condition.
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