Pre-experimental designs are subject to various threats to internal validity.
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Q39: The Clore et al. study of the
Q40: In Campbell and Ross's analysis of the
Q41: An experiment's internal validity depends upon how
Q42: The basic principle of good experimental design
Q43: "Pre-experimental designs" refer to studies involving direct
Q45: "Selection" refers to systematic differences among subjects
Q46: Selection effects may occur whenever college students
Q47: Instrumentation is a threat to internal validity
Q48: Attrition effects pertain only to studies using
Q49: Random assignment controls for the effects of
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