Math, Statistics and Probability
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 After Course
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
Construct the 95% confidence interval for the mean difference between the exam scores before the course and exam scores after the course.
