The academic achievement of 20 students was measured under the influence of the traditional method of explanation, and then the academic achievement of them was measured in the same subject under the influence of the modern method of teaching and the data of the two situations are as follows:

Pupil grades before applying the modern method

6-12-35-17-60-15-19-85-62-24-65-50-46-19-43-17-50-33-39-14-42

Students grades after applying the modern method

7-65-70-33-80-56-30-78-32-87-70-65-70-72-74-69-68-60-56-68-61

What is required is the research hypothesis test: "There are statistically significant differences between the average scores of students in achievement before and after the application of the modern method", with calculating the size of the effect?

- Tabular = 861.2

- at the significance level (0.01)

T = 2.093

At the significance level (0.05)