TABLE 10-5 To Test the Effectiveness of a Business School Preparation Course

Multiple Choice

TABLE 10-5
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
Student Before Course (1) After Course (2)
1 530 670
2 690 770
3 910 1,000
4 700 710
5 450 550
6 820 870
7 820 770
8 630 610
-Referring to Table 10-5, the number of degrees of freedom is

A) 14.
B) 13.
C) 8.
D) 7.