THE EFFECTIVENESS OF USING STIMULER APPLICATION AND VOCABULARY MASTERY ON SPEAKING SKILLS IN CIREBON VOCATIONAL HIGH SCHOOL

Abstract

This study aims to examine the effectiveness of using the Stimuler application and vocabulary mastery on speaking skills at vocational high schools in Cirebon. A quantitative method with a survey design was employed, involving 149 tenth-grade students from SMK Kartika XIX Kota Cirebon and SMK Ponpes Manbaul Ulum in the 2024/2025 academic year. The research instruments consisted of a Stimuler usage questionnaire, a vocabulary test, and a speaking test. Multiple regression analysis revealed that the Stimuler application had a significant effect on speaking skills (t = 12.256, p < 0.05), as did vocabulary mastery (t = 3.839, p < 0.05). The F-test further indicated that both variables simultaneously had a significant effect (F = 84.961, p < 0.05), contributing 53.8% to the variance in speaking skills (R² = 0.538), while the remaining 46.2% was influenced by other factors beyond this study. These results suggest that integrating the AI-based Stimuler application with vocabulary mastery is effective in enhancing vocational students’ speaking proficiency and creating a more interactive and engaging learning environment.