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Crucigrama Sopa de Letras Hoja de Trabajo
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Quasi Experiments Puzzle (A)

Horizontales
Type of assingment in a true experiment
Variable varied in the true experiment
Verticales
Unplanned event that happened outside of study
Threat of internal validity has to do with developmental change
Requirement for causality of IV and DV
To show causality there must be no alternative...
One of the threats to internal validity has to do with preexisting differences