THE EFFECTIVENESS OF USING CHATGPT ON STUDENTS’ WRITING SKILLS IN SENIOR HIGH SCHOOL

The study aims to assess the effectiveness of ChatGPT in improving grade XI students' writing skills at SMAN 1 Puloampel. The method used was a quantitative approach with a quasi-experimental design involving 60 students divided into a control group and an experimental group. Data were collected through pre-tests and post-tests in the form of essays. The results of the analysis using the Independent T-test showed a significance value (2-tailed) of 0.000, which means that the null hypothesis (H0) can be rejected, supporting the alternative hypothesis (Ha). Moreover, the effect size test yielded a value of 1.18, indicating a "high effect" category according to Cohen's interpretation. It suggests that ChatGPT was an effective medium in improving the writing skills of eleventh-grade students at SMAN 1 Puloampel, particularly in explanation text material.