Consider two groups of students: B1, students who received high scores on tests, and B2, students who received low scores on tests. In group B1, 40% study more than 25 hours per week, and in group B2,...

Consider two groups of students: B1, students who received high scores on tests, and B2, students who received low scores on tests. In group B1, 40% study more than 25 hours per week, and in group B2, 20% study more than 25 hours per week. What is the overinvolvement ratio for high study levels in high test scores over low test scores?