<![CDATA[Statistics is often considered difficult by high school students because the learning approach tends to be theoretical and less interactive, resulting in students' low mathematical understanding of concepts such as mean, median, and mode. This study aims to develop educational website-based learning media with a Problem-Based Learning (PBL) approach to improve students' mathematical understanding. The research method uses the Research and Development (R&D) model with the adoption of the ADDIE (Analysis, Design, Development, Implementation, and Evaluation) model. The research subjects were grade XI students of Imelda Private High School Medan who were divided into an experimental class (using PBL website media) and a control class (conventional method). Data were collected through validation sheets, student response questionnaires, and mathematical understanding tests (pre-test and post-test). The results of the website media were declared "Very Feasible" with a validation score of 95%. The effectiveness results showed a significant increase in the average post-test score (63.91) from the pre-test (26.26), with a Normalized Gain (N-Gain) score of 0.51 (category "Medium"). The student response questionnaire also showed a positive response, with an average of 82.57% ("Effective"). Implications This media, which has innovative features such as a statistical calculator and Excel upload data analysis, serves as an effective scaffold for PBL, encouraging students to conduct data analysis independently, and helping shift 73.9% of students from the "Very Low" ability category.]]>
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