<![CDATA[This quantitative research was conducted to see if the use of English subtitled video on YouTube is effective to increase students’ vocabulary achievement, and to investigate the students’ perception on the use of English subtitled video on YouTube in vocabulary learning. The researcher used one group pretest and posttest design. The sample of this research was IX C students at SMP Negeri 1 Ambarawa. The instruments used in this study were vocabulary test and questionnaire. The data were analyzed by using Repeated Measures T-Test in Statistical Package for Social Science (SPSS) software in which the significance was determined by p0.05. The result of the research showed that the mean score of pretest was 4.6 while the posttest was 6.1 with 1.5 different points. The result of t-value (6.049) was higher than t-table (2.045), and the value of significance was 0.000 0.05. It indicated that the hypothesis was accepted; therefore, there is a significant difference between students vocabulary achievement after teaching by using English subtitled video on YouTube. Moreover, the researcher used close-ended questionnaire to investigate the students’ perception after the implementation of English subtitled video on YouTube in vocabulary learning. The result of the questionnaire showed that the use of the medium was enjoyable, effective, and beneficial for students to learn vocabulary. This was proven by the result of the percentage of each item of the questionnaire which showed more than 70%. Thus, based on the result, it is concluded that English subtitled video on YouTube can be applied to increase students’ vocabulary achievement.Keywords: Effective, Perception, Subtitled Video, Vocabularydoi:https://dx.doi.org/10.23960/UJET.v10.i3.202105]]>
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