The Effect of PBL-STEM on Improving problem Problem-solving Ability and Self-efficacy of Vocational High School Students

Authors

DOI:

https://doi.org/10.21831/jpms.v13iSpecial_issue.89341

Keywords:

PBL, Problem-solving skills, Self-efficacy, STEM

Abstract

Research needs to be conducted with the aim of significantly comparing the problem-solving skills and self-efficacy between students who follow learning with Problem Based Learning (PBL) enriched with Science, Technology, Engineering, Mathematics (STEM) and students who follow learning with a scientific lapproach to chemistry, focusing on substances and their changes. The research method is quasi-experimental quantitative research. Cluster random sampling techniques are used to determine the control group (classes applying a scientific approach) and the experimental group (classes applying the PBL-STEM model). The study uses 1 control class and 1 experimental class. Each class averages 36 students. The instruments consist of problem-solving questions and self-efficacy questionnaires validated for construct, content and empiric. Empirical validation of self-efficacy questionnaire, initial number of items = 48, Valid items = 35, Invalid items = 13. Cronbach's alpha reliability test using SPSS yielded a Cronbach's alpha coefficient of 0.779 > 0.6, indicating that the self-efficacy questionnaire is reliable. Empirical validation of problem-solving questions, initial number of items = 12, Valid items = 9, Invalid items = 3. The Cronbach's alpha coefficient is 0.644 > 0.6, indicating that the questions are reliable.The 9 prerequisite tests for MANOVA are met and followed by the MANOVA test. The research results indicate that the multivariate Hotelling's trace test with Sig 0.000 < 0.05 shows a significant difference in problem-solving skills and self-efficacy originating from different classes. The practical implication is that schools and teachers can consider adopting and integrating the PBL-STEM model into the curriculum, especially for science subjects like chemistry. Thus, teaching will not only focus on knowledge transfer but also on developing essential 21st-century skills.

Author Biographies

Agil Wantrilita, Universitas Negeri Yogyakarta

Is a permanent teacher at Rongkop High School His research focuses on Science Technology Engineering and Mathematics (STEM) and its applications in education and science. He can be reached at agilwantrilita.2022@student.uny.ac.id

Eli Rohaeti, Universitas Negeri Yogyakarta

Is a faculty member in the Department of Chemistry Education at Yogyakarta State University. Her teaching and research expertise spans several areas, including physical chemistry, polymer chemistry, chemical equilibrium, and various aspects of chemistry education such as models, literacy, and critical thinking. She can be contacted via email at eli_rohaeti@uny.ac.id

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Published

2025-09-13

How to Cite

Wantrilita, A., & Rohaeti, E. (2025). The Effect of PBL-STEM on Improving problem Problem-solving Ability and Self-efficacy of Vocational High School Students. Jurnal Pendidikan Matematika Dan Sains, 13(Special_issue), 226–236. https://doi.org/10.21831/jpms.v13iSpecial_issue.89341

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