This study aims to analyze students' writing abilities before and after using Quillbot and to determine significant differences in their grammar modification skills. The study uses a quantitative approach with a quasi-experimental design. Data were collected through writing tests administered before and after using Quillbot, and then analyzed using statistical analysis and a paired sample t-test in IBM SPSS Statistics 25. The results showed that the average pre-test score of 53.97 increased to 81.4 on the post-test. The t-test yielded a Sig. (2-tailed) value of 0.000 < 0.05, indicating a significant difference between students' writing abilities before and after using Quillbot. Thus, Quillbot has been proven effective in enhancing students' writing skills through improved grammar modification.
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