Answer both parts i will upvote

7. In an elementary school class, you want to investigate whether a certain pedagogical effort can be said to have someone effect on students' abilities. You select 5 students who are allowed to take a mathematics test. The do a test before the pedagogical effort and an (equivalent) test after. It's the same 5 students on the two occasions. Before the intervention, students receive the following points on the test: Elev 1 2 3 Poang 15 14 10 13 11 After the effort, they receive the following points: Elev 1 2 3 4 5 Poang 16 14 12 12 12 It is assumed that the points distribution is normally distributed. a) Create a 95% confidence interval for the expected difference in points. b) At the given level of confidence, can one say something about whether the pedagogical effort has any effect on the students' abilities? Motivate your