In each of the following experiments, identify the independent variable, the condi-tions of the independent variable, and the dependent variable: (a) Studying whether scores on a final exam are influenced by background music that is soft, loud, or absent. (b) Comparing freshmen, sophomores, juniors, and seniors with respect to how much fun they have during the college semester. (c) Studying whether being first born, second born, or third born is related to intelligence.