A Comparative Study of Students’ Vocabulary Mastery before and after Joining Epic English Course

Steven Salvator Liem, Arif Suryo

Abstract


This study investigates the effectiveness of the Epic English Course in enhancing students’ vocabulary mastery. Using a quantitative pre-experimental design with a one-group pre-test and post-test approach, the research involved 30 students whose vocabulary performance was measured before and after participating in the course. The results showed a significant improvement, with the mean score increasing from 53.33 to 79.78, indicating an average gain of 26.45 points. Statistical analysis using a paired sample t-test revealed a t-value of -55.323 and a significance level of 0.000 (p < 0.05), confirming the improvement was statistically significant. Moreover, the effect size, calculated using Cohen’s d, was 10.1, indicating a very large practical impact. The findings demonstrate that the Epic English Course, through its interactive, contextual, and student-centered approach, is highly effective in improving students’ vocabulary mastery and can serve as a valuable supplement to traditional classroom instruction.


Keywords


Vocabulary Mastery; Epic English Course; Vocabulary Acquisition

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DOI: https://doi.org/10.31004/jele.v10i4.1267

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