please help with this one

6. 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. -Note: By "the conditions," the question is asking for the different levels of the variable. For example, in (b], small, medium, and large are the conditions of type of college