THE INFLUENCE OF USING SEMANTIC MAPPING TECHNIQUE TOWARDS STUDENTS’ VOCABULARY MASTERY AT THE FIRST SEMESTER OF THE EIGHTH GRADE OF SMP NEGERI 10 BANDAR LAMPUNG IN THE ACADEMIC YEAR OF 2016/2017

Vocabulary plays an important role in understanding a language. By having adequate vocabulary, people would be able to communicate to other people and express their idea clearly and easily. However, some students have problems to understand the meaning of the words. In addition, they have low ability to use some vocabularies in the sentences. This problem also happened to the students of SMP Negeri 10 Bandar Lampung. Their vocabulary mastery was poor. Due to this problem, this research was conducted to know whether there is a significant influence of using semantic mapping towards students’ vocabulary mastery at the first semester of the eighth grade of SMP Negeri 10 Bandar Lampung in the academic year of 2016/2017. In this research, the researcher used quasi-experimental design by employing group pretest-posttest. The writer took two classes; they were experimental class and control class. The sample was taken by using cluster random sampling technique. The writer took two classes, VIII A and VIII C consisted of 78 students. In collecting the data, the writer used multiple choice test which consisted of 30 items for pre-test and posttest after validation. After analyzing the data, it was found that there was a significant influence of using semantic mapping towards students’ vocabulary mastery at the first semester of the eighth grade of SMP Negeri 10 Bandar Lampung. It was found that the result of Sig. (2-tailed) of the equal variance was 0.00, and α = 0,05. Hα is accepted if Sig. (Pvalue) ≤ α = 0,05 and Hο is accepted if (Pvalue) if Sig ≥ α = 0.05. It means that Sig. (Pvalue) is 0.00 ≤ α = 0.05. So Hα is accepted. It can be concluded that there is a significant influence of using semantic mapping towards students’ vocabulary mastery at the second semester of the eighth grade of SMP Negeri 10 Bandar Lampung in the academic year of 2016/2017. Keywords: Semantic mapping, quasi-experimental design, students’ vocabulary mastery