(Choose 1 answer)
(See picture)
A. 68
B. 400
C. 0
D. 50
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
670
770
1,000
710
550
870
770
610
Student Before Course (1)
1
2
3
4
5
6
7
8
530
690
910
700
450
820
820
630
E. None of the other choices is correct.
ITT After Course (2)
The value of the sample mean difference is if the difference scores reflect the results of the exam after the course minus the results of the exam before the course.
(17
