<![CDATA[This study explores how effective bilingual teaching can be enhancing students' vocabulary mastery at SMK Tiara Nusa Borong, specifically focusing on class X ULW 2. The researcher conducted research with a group of 30 students, who participated in vocabulary lessons delivered in both English and Indonesian. To measure the impact of this teaching method, the researcher used a pretest-posttest design. The data analysis involved descriptive statistics and a paired sample t-test and correlation analysis. The researcher observed a notable improvement in students vocabulary scores. On average, their scores jumped from 35.00 in the pretest to an impressive 73.00 in the posttest. Additionally, the lowest score improving signifucantly, rising from 10 to 50. The analysis also revealed a strong correlation between pretest and posttest results, with a correlation coefficient of r=.595 and p-value of .006, indicating that the changes were statistically significant.]]>
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