How Would the Statement "I'm Not Convinced" in the Following

Essay

How would the statement "I'm not convinced" in the following passage be analyzed and mapped? "People believe that small class sizes are essential for better learning. They think that because they have seen statistical studies showing that in schools with a richer teacher to student ratio the students' scores on standardized tests tend on average to be higher. I'm not convinced. I say that a good teacher with a large group can be just as effective as a lousy teacher with a small group. And I can give you examples of kids who did really well on standardized tests even though their schools did not have a rich teacher to student ratio."