11) An educational institute claims that their new exam preparation course improves test scores by at least 15%. You gather test scores before and after the course from 25 students: Student 1 2 3 4 5 6 7 8 9 10 11 12 13 Before 75 80 70 85 90 60 78 95 70 88 82 76 65 After 85 90 78 88 95 70 85 97 75 92 89 83 70

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