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 in the accompanying table. What is the value of the sample mean difference if the difference scores reflect the results of the exam after the course minus the results of the exam before the​ course?   Student Exam Score Before Course​ (1) Exam Score 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   A. 68   B. 0   C. 50   D. 400

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