7. For each of the following, identify the variables by placing a V over them. When possible, identify them as either dependent (or criterion) (DV) or independent (predictor) (IV) variables. a. Are there differences in college learners' choice of science careers between those exposed to laboratory classes in the late elementary grades and those who were not exposed to lab classes? College learners' choice of science careers (DV) Exposure to laboratory classes in the late elementary grades (IV) b. Is there a relationship between age and interest in music education? Interest in music education (DV) Age (IV) c. Is there a relationship between the size of family and feelings of social competence in middle school girls? Feelings of social competence in middle school girls (DV) Size of family (IV) d. What are the variables that best predict completion of an initiated doctoral dissertation? Completion of an initiated doctoral dissertation (DV) Variables that best predict completion (IV) e. Are there gender differences in average time of homework completion? Average time of homework completion (DV) Gender (IV)