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To test the effectiveness of a business school preparation course, 8 students took a general business test before and after the course. The results are given below.
Α. 14.696
Β. 60.828
Student
1
2
3
4
5
6
7
8
Exam Score
Exam Score
After Course (2)
670
770
1,000
710
550
870
770
610
C. 22.991
Before Course (1)
530
690
910
700
450
820
820
630
D. 65.027
The value of the standard error of the difference scores is
8
