THE EFFECT OF PROBLEM BASED LEARNING (PBL) MODEL ON THE STUDENT’S VOCABULARY MASTERY ASSISTED EDUCAPLAY MEDIA

Abstract

This research aims to examine  the effect of Problem Based Learning (PBL) Model and Educaplay Media on student's Vocabulary Mastery at grade X of SMA Negeri 2 Kisaran in 2024/2025 academic year. Using a quantitative method with a pre-test and post-test experimental design, this research involves the students in class X-1         and X-2 who are selected through a random sampling technique. Student's Vocabulary Mastery was assessed through pre-test and post-test results to determine the effectiveness of the PBL model and Educaplay Media in improving their understanding Vocabulary. The results show a significant increase in Vocabulary Mastery, with an average score increase of 9,2% in one group and 16.2% in the other group. Data analysis using the t-test revealed that the increase was significant, as evidenced by the t-scores value exceeding the critical value at the 0,05 significance level. With degrees of freedom (df) 70 and a significance level of 0,05, the t-scores value was obtained of 8,54 which was greater than the t-table, which was 1,667 (8,54 > 1,667). These results indicated that the alternative hypothesis (Ha) is accepted, which confirms the effectiveness of the PBL model and Educaplay Media in improving student's Vocabulary Mastery.