(Choose 1 answer)
(See picture)
A. 22.991
B. 60.828
C. 14.696
D. 65.027
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.
Exam Score
Exam Score
After Course (2)
670
770
1,000
710
550
870
770
610
Student
1
2
3
4
5
6
7
8
Before Course (1)
530
690
910
700
450
820
820
630
The value of the standard error of the difference scores is
