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(Choose 1 answer)
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☐ A
A. 14
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.
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B. 7
C. 13
D. 8
FUQ.sh
sh the exam.
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
630
610
The number of degrees of freedom is
