A middle school has tried out the evaluation system of students' behavior since 2010. Recently, the student affairs office of the school investigated students' satisfaction with the evaluation system. The data show that the students with high scores have high satisfaction with the evaluation system. As a result, the student affairs office has come to the conclusion that all the students with good performance are satisfied with the evaluation system.
The assumption that the conclusion of the student affairs office of the school is based on is that the students who perform well are all students with high scores.