This study aimed to investigate the effectiveness of English animation movies in improving students' vocabulary mastery. This study employed a quantitative approach using a pre-experimental design with a one-group pre-test and post-test design. The sample consisted of 20 eighth-grade students of SMP Negeri 1 Bungku Barat selected through purposive sampling. Data were collected through vocabulary tests consisting of multiple-choice and matching items. The results showed that the students' mean score increased from 50.50 in the pre-test to 63.00 in the post-test, indicating an improvement in vocabulary mastery. Furthermore, the obtained t-value was -4.258 with a degree of freedom (df) of 19. Thesignificance value (2-tailed) was 0.000, which was lower than the significance level of 0.05 (0.000 < 0.05). Therefore, the null hypothesis (H₀) was rejected, while the alternative hypothesis (H₁) was accepted. These findings indicate that the use of English animation movies was effective in improving the vocabulary mastery of eighth-grade students at SMP Negeri 1 Bungku Barat.
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