Abstrak
ABSTARCT Novia Alfitri Nim 2315.124. Thesis. The student’s vocabulary acquisition addicted to play online games at eleventh grade of SMK Cendana Padang panjang. Educational Institutions. English education study program. IAIN Bukittinggi. 2020. This research was done due to several problems faced by the eleventh grade students at SMK Cendana Padang Panjang related to vocabulary. Students are addicted to play online games have problems in vocabulary acquisition. The comparison students addicted play online games with students not addicted to play online games and then the reason why similarity or different between addicted with not addicted. The design of this research was causal comparative research with mixing method. The data were got through questionnaire, test and interview. The population of this research were the eleventh grade students at SMK Cendana Padang Panjang academic year 2019/2020 consist of 117 students. To determine the sample, the researcher used non probability sampling especially quota sampling by four class, they were XI TKJ 1, XI TKJ 2, XI TKJ 3 and TAV. There are 73 students. The data analysis researcher used U-test by Mann Whitney used SPSS 20 application with significance α = 0, 05. The finding show that there are similarity between students are addicted to play online games with students are not addicted to play online games, where score sig > 0, 05 obtained H_i is accepted and H_o is rejected. The analysis of the data the researcher used the questionnaire to grouping of students addicted to play online games with students not addicted with total 73 students. The result of test from students addicted to play online games are mean (X ̅=28,78) and students are not addited mean(X ̅=24,03). And then the data was analyzed by using U-test by Mann Whitney and the result if sig.(0,607>0,05) H_i is accepted and H_o is rejected. so have similarity between students addicted to play online games with students not addicted to play online games. Then interview to find out causes why there are similarities between students addicted to play online games with students are not addicted in vocabulary acquisition. the students do not have initiative to more interesting about meaning of vocabulary in online games, and the student’s only focus on playing online games without being able to use online games to improve their vocabulary.. Key words: vocabulary acquisition and addicted to play online games.