연구 대상에 따라 평균 효과의 차이가 있는지 확인한 결과, 초등학생과 고등학생 사이에 유의미한 차이가 있음이 확인되었다.
After checking if there was a difference in the average effect according to the study subject, it was confirmed that there was a significant difference between elementary school students and high school students.