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学生考试成绩的变化情况是各方面非常关注的一个问题。应用散布图能够简便、直观地将学生成绩坐标象星座那样显示出来,向教师、学生和家长提供改进教与学的图示信息。例如:某次期中考试为X轴,同科期末考试为Y轴。根据每个学生的期中成绩和期末成绩确定坐标,标注学号以便识别。A—A′线为期中考试平均(分)线,B—B′线为期末考试平均(分)线。附图是一组学生成绩动态分布图(期末考试与期中考试成绩相关散布图)。第一类(Ⅰ象限):两次成绩均在平均分以上,学习状态比较稳定,应努力保持现状,如11号等。第二类(Ⅱ象限):学习成绩有比较明显的进步,如7号的进步非常突出。
The change in students’ test scores is a matter of great concern to all. Application scatter diagrams can easily and intuitively display student performance coordinates as constellations, providing teachers, students, and parents with graphical information to improve teaching and learning. For example: A mid-term exam is the X-axis, and the final exam of the same subject is the Y-axis. According to each student’s mid-term results and final results, the coordinates are identified and the student number is marked for identification. A-A’ line is the average (sub-line) of the mid-term exam, and the B-B’ line is the average (minute) line of the final exam. The figure is a dynamic distribution map of a group of students (a scatter plot related to the final exam and midterm exam results). The first category (I quadrants): Both scores are above the average score, the learning status is relatively stable, and efforts should be made to maintain the status quo, such as the 11th. The second category (II quadrant): There are more obvious progress in academic achievement, such as the progress of the 7th is very prominent.