Abstract:
This study was carried out to find out the students’ achievement in vocabulary
using Duolingo Application. The descriptive quantitative methods was applied to
describe the data. The population of this research was the second class of
Madrasah Tsanawiyah Negeri 3 Medan, which was divided into the experimental
and control class and the total of the sample was 73 students. The researcher gave
25 questions about vocabulary to collect the data in pre-test and post-test. T-test
formula was used by the researcher to analyze the data. In this research, it was
found that the mean of pre-test score in experimental class was 57.30 and in
control class was found 49.56. Meanwhile, the mean of post-test score which
found in experimental class was 82.49 and in control class was 70.22. It can be
counted from the students’ score that tcount was 3.864, whereas the ttable was 1.993
for = 0.05 with the degree of freedom ( ) 71. It means that tcount was higher
than ttable (3.864 > 1.993). So, alternative hypothesis (Ha) was accepted and null
hypothesis (Ho) was rejected in this research. In an addition to this result, using of
Duolingo Application had significant effect as media in English teaching learning
process. In another instrument was giving questionnaire to measure students’
perception toward the using of Duolingo Application and the researcher was
found out that most of students were agree toward using Duolingo Application
could be made them more interested in English teaching learning process
especially when learning vocabulary. In this term, it can be concluded that none of
students who responded disagree or strongly disagree toward the questionnaire
that have given by the researcher
