28- 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. 530 670 690 770 13 910 1.000 4 700 710 15 450 550 820 870 820 770 630 610 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. a) 0. b) 68 C) 50 d) 400 .000

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28- 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)
530
670
690
770
910
1,000
4
700
710
450
550
820
870
17
820
770
630
610
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.
a)
68
C)
50
400
0000
Transcribed Image Text:28- 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) 530 670 690 770 910 1,000 4 700 710 450 550 820 870 17 820 770 630 610 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. a) 68 C) 50 400 0000
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