Researcher: Results indicate that the higher their educational level, the better are students' mathematical skills
These results do not prove that education improves mathematical skills, however, since it is possible that students who have better mathematical skills to start with are the students who reach higher educational levels
Results indicate that the quality of papers submitted for publication varies significantly from university to university. This may say nothing about the quality of education offered at different schools, but may only reflect a defect in the review process.