"Selection" refers to systematic differences among subjects who are assigned to different experimental conditions.
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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
Q44: Pre-experimental designs are subject to various threats
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
Q50: History is basically a problem of external
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