A school is implementing an SAT preparation program. To study the program's effectiveness. (point) the school looks at participants' SAT scores before starting the program and after completing
the program. The results are shown in the table.
ABCDEFG
Before 1060 980 1140 1040 1000 960 1200
After 1040 1020 1180 1040 980 1020 1240
Difference 20 -40 -40
20
0
-40
How can the values in the Difference row of the table be interpreted?
1. A positive difference means that the student's score increased after the program, and a negative difference means that the student's score decreased after the program
2. A positive difference means that the student's score decreased after the program, and a negative difference means that the student's score increased after the program
3. A positive difference means that the program was effective, and any negative differences can be ignored
4. A negative difference means that the program was effective, and any positive differences can be ignored.