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.

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.

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


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