This study examined the effectiveness of the JASP-Focus Seminar as an intervention in enhancing Grade 11 students' skills in solving statistical problems at Baltazar Nicor Valenzuela National High School. Specifically, it aimed to determine the significant difference between the students' pretest and post-test scores. A pre-experimental research design was employed to assess the impact of the intervention. Data were collected from 67 Grade 11 students using purposive sampling, with pretest and post-test scores serving as the primary instruments. The results revealed a notable improvement in student performance following the intervention. The mean percentage of the pretest score was 36%, indicating a poor level of understanding, while the post-test percentage mean score rose to 70%, classified as high. The paired t-test analysis showed a statistically significant improvement, t(66) = 30.1, p < .001, demonstrating the strong positive effect of the JASP-Focus Seminar on students’ statistical problem-solving skills. To further understand the students’ learning experiences, in-depth interviews were conducted, which led to the emergence of six major themes: (1) gaining understanding through applying practical and real-life data; (2) simplifying statistical problem-solving through JASP-assisted learning; (3) improving confidence and understanding; (4) hands-on and interactive activities increase learning; (5) struggling with selecting the appropriate statistical test; and (6) experiencing ease of statistical calculations compared to manual methods. Overall, the findings confirm that the JASP-Focus Seminar significantly improved students' competency in statistics by promoting both conceptual understanding and computational ease.