IMPROVING STUDENTS' VOCABULARY MASTERY BY USING DUOLINGO APPLICATION

Abstract

This study was conducted to examine how effectively the Duolingo app improves vocabulary mastery among ninth-grade students at Pattanakansuksa Foundation School during the 2024 academic year and it also sought to determine whether there was a significant difference in vocabulary development between students who used Duolingo and those who did not. To achieve this, a quantitative research method with a true-experimental design was employed, involving pre-test and post-test administered to two groups. The study sample included 30 students out of a total population of 107 ninth graders, with 15 students in the experimental group that used Duolingo and 15 in the control group that did not used. Data analysis was carried out using IBM SPSS26 software, which revealed a significant difference in vocabulary test scores between the groups. The Duolingo group achieved a higher average post-test score of 86.67, compared to 65.07 in the control group. Paired samples t-tests confirmed the statistical significance of these results, with a p-value of 0.000, which is below the 0.05 threshold. These findings indicate that Duolingo effectively enhances vocabulary mastery and supports its integration into language learning curricula.