In the following experiments, identify the independent variable, the conditions, and the dependent variable:
 (a) studying whether final exam scores are influenced by whether concurrent background music is soft, loud, or absent;
(b) comparing students from small, medium, and large colleges with respect to how much fun they have during the semester;
 (c) studying whether being first-, second-, or third-born is related to intelligence;
 (d) studying whether length of daily exposure to a sunlamp (15 versus 60 minutes) accounts for differences in depression;
(e) studying whether being in a room with blue walls, green walls, or red walls influences aggressive behavior in adolescents.
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