Lutfia Dwi Jayanti , 2201411010 (2015) THE EFFECTIVENESS OF SUBTITLED ENGLISH SONGS TO IMPROVE THE VOCABULARY MASTERY OF JUNIOR HIGH SCHOOL STUDENTS (A Quasi Experimental Research for the Eighth Grade Students of SMPN 39 Semarang). Under Graduates thesis, Universitas Negeri Semarang.

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Abstract

This study was a quasi-experimental research aimed at finding out whether subtitled English songs effectively improve students’ vocabulary or not. The population of this study were 285 students from the eighth grade of SMP Negeri 39 Semarang in the academic year 2014/2015. Of this population, two classes were chosen as the experimental group (VIII-G) and the control group (VIII-H) consisting of 32 students for each group. Thus, there were 64 students as the samples. In obtaining the data, the writer conducted four steps of experiment. The first, the writer conducted try out test to measure the validity and reliability of the instrument. Then, the pre-test was conducted to the experimental and control group. Third, the treatment was conducted for the experimental group. It was conducted three times. The last, the posttest was given to both the experimental and control group. Based on the result of the analysis, it is shown that the students’ progress in mastering vocabulary for both groups is good after they were given the treatment. It is shown from the different means result in the experimental group, that is from 68 in the pre-test to 84.3 in the posttest. Thus, it has 16.3 in difference. In the control group the difference between the two means is 11.5. 66.7 in the pre-test and 78.2 in the posttest. To check whether the treatment significantly influenced students’ vocabulary, the t-test formula was used. Based on the result of the computation, the t-value is 4.27. This result was consulted with the critical value on the t-table with 5% alpha level of significance and 62 degrees of freedom by using interpolation. Based on the result of interpolation, the critical value is 1.999. Since t-value is higher than t-table (4.27 > 1.999) it can be concluded that subtitled English songs effectively improve students’ vocabulary compared to the Grammar Translation Method. Thus, it is suggested that the teachers may use subtitled English songs in their teaching practice especially in improving students’ vocabulary.

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