Ten students are given coaching for environmental statistics. The score obtained in tests
1 and 5 are given below:
Sl No of student 1 2 3 4 5 6 7 8 9 10
Marks in 1st test 50 52 53 60 65 67 48 69 72 80
Marks in 5th test 65 55 65 65 60 67 49 82 74 86
Does the score from test 1 to test 5 shown an improvement? Test at 5% level of
significance.