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(Choose 1 answer)
(See picture)
☐ A
A. 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.
☐ D
☐ E
B. 68
C. O
Exam Score
Student Before Course (1)
Exam Score
After Course (2)
D. 400
1
530
670
E. None of the other choices is correct.
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12345676
690
770
910
1,000
700
710
450
550
820
870
820
770
8
630
610
The value of the sample mean difference is
reflect the results of the exam after the course minus the results of the exam
before the course.
if the difference scores
FUQ.sh
sh the exam.
