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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.
|
Student
|
Exam score
Before Course (1)
|
Exam Score
After course (2)
|
|
1
|
530
|
670
|
|
2
|
690
|
770
|
|
3
|
910
|
1000
|
|
4
|
700
|
710
|
|
5
|
450
|
550
|
|
6
|
820
|
870
|
|
7
|
820
|
770
|
|
8
|
630
|
610
|
Referring to Table 10-5, 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.
|
|
|
0
|
|
|
|
50
|
|
|
|
68
|
|
|
400 |
