Nila Nur LAILA Pengarang Rostanti Toba, M.Pd. Dosen Pembimbing 2 Bahrani, M.Pd. Dosen Pembimbing 1 Rostanti Toba, M.Pd. Ketua Penguji Dini Irawati, M.Pd. Penguji 1 Dina Destari, S.S., M.Pd. Penguji 2

Nila Nur Laila (1611204028) The Effectiveness of Using Vlog Media in Speaking Skill at Twelfth Grade Students of SMK Nasional Muara Jawa in Academic year 2020/2021. Thesis of English Education Department, Teacher Training and Education Faculty, State Islamic Institute of Samarinda. This research is under the guidance of Bahrani, M. Pd as advisor 1 and Rostanti Toba, M. Pd as advisor 2. The students usually talk and describe various topics such as hobbies, tips, or brief speech. Hence, students have utilized vlog as online diaries. More input from several aspects including hobbies, motivation, and interests are required in enhancing foreign language learners’ speaking skills outside the classroom. At the SMK Nasional Muara Jawa, students not only learn in theory but also practice speaking English. The purpose of this research is to know the effective of using vlog on students’ speaking at twelfth grade of SMK Nasional Muara Jawa. The method used is quantitative a method with quasi-experimental research as the design. This sample This study involved 21 students of class XII accounting 1 as an experimental class and 27 students Class XII students of administration business 1 as the control class. To collect the data from both classes, this research used a speaking test provided in a pre-test and post-test as the research instrument. The obtained data from both pretest and post-test were calculated and analysed by using IBM SPSS Statistic 21. And the result revealed that the post-test mean score of the experimental class was greater than that of the controlled class, namely (83.29>73.22). It meant that the experimental class and the controlled class were different significantly in their posttest mean score. Then, the result of hypotheses analysis showed that tobserve was higher than ttable (5.327>2.998) and the significance 2- tailed (P) was lower than the alpha (0.000 <0.05). It meant that H0 was rejected and Ha was accepted. Thus, it can be considered that using vlog has given significant effect on students’ speaking skill. In addition, the result was also measured by using cohen’s d effect size measurement to know the strenght of the effect. And the result showed that using vlog in teaching speaking gave a moderate effect on students’ speaking skill with the effect size of 0.59.