PENGGUNAAN DUOLINGO APP UNTUK MENINGKATKAN JUMLAH KOSAKATA SISWA KELAS VIII SMP NEGERI 15 PALU

ABSTRACT

The objective of this research is to find out whether the use of Duolingo app can increase the students' vocabulary size or not; the researcher applied a quasi-experimental research design which involved experimental and control class. The population of this research was the eighth-grade students at SMP Negeri 15 Palu. The researcher selected the sample by using a purposive sampling technique. The sample of this research was the students of VIII A consist of 28 students as an experimental class and VIII B consist of 26 students as a control class. The technique of data collection used instrument tests (pre-test and post-test). The experimental class was treated by applying the Duolingo apps. The result of the data analysis showed that there was a significant difference between the pre-test and post-test. The researcher found that the t-counted (14.36) was higher than the t-table (2.009). It means that the hypothesis was accepted. In conclusion, the use of Duolingo apps effectively increases the vocabulary size of the eighth-grade students of SMP Negeri 15 Palu.

Keywords: Duolingo App, Increase, Vocabulary Size