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This study investigated the effectiveness of using Webtoon to enhance English vocabulary mastery among eighth-grade students at SMPN 1 Siantan. A one-group pretest-posttest design of pre-experimental was employed, with 33 students selected through cluster random sampling. Data were collected using pre-tests and post-tests in the form of multiple-choice test. The analysis of the t-test results indicated a significant improvement in students' mastery of past verbs after the use of Webtoon in instruction. The calculated t-test value was 22.595, which substantially exceeded the critical t-table value of 1.694. This statistical outcome led to the rejection of the null hypothesis and the acceptance of the alternative hypothesis, confirming that Webtoon had a positive impact on students' understanding of past verbs. Additionally, the effect size was determined to be 3.91, signifying a substantial effect. These results underscore the effectiveness of incorporating Webtoons into the teaching strategy for enhancing students' English vocabulary, particularly in mastering past verbs.
Amelia et al. (Sat,) studied this question.