1학기말 성적은 사회ㆍ문화에 대한 학업 능력의 대리 변인으로 이용하였고, 50점 이상과 미만으로 구분하였다.
The grades of the final exam of the first semester were used as a surrogate variable of academic ability for society and culture, and the students were divided into those with 50 points or higher and those with lower than 50 points.