An MPA lecturer wants to know the effect of the "individual assignment" method on the effectiveness of the lectures he teaches. The lecturer teaches 2 classes. Class A consists of 15 people, while class B only has 13 people. The treatment given by the lecturers in the two classes was different. In class A, the lecturer uses standard learning methods, namely lectures, questions and answers and examples of practice in class. Meanwhile in class B, in addition to using standard learning methods, lecturers also always give individual assignments at the end of each learning session. At the end of the lecture, the lecturer then gave a test to test the increase in student knowledge. The instrument used to test students in both classes is the same instrument. The data from the results of the distribution of the two questionnaires are as set out in the following table: Student Grades in Class A Student Grades in Class B 80 89 12 9O 89 13 87 9O 87 88 93 90 88 85 12 87 13 81 14 80 15 91 83 82 80 9O 9O 87 91 85 92 1 2 3 4 5 6 7 'OOO'Nlooleloa "OCD O O