Effect of STEM Integrated Problem-Based Learning Model on Students' Critical Thinking Skills on Electrolyte and Non-Electrolyte Solution Materials

This study aims to study the effect of problem-based learning integrated STEM and non-STEM learning models in improving critical thinking skills and their differences of learning process. The method used is a quasi-experimental design with a pretest-posttest non-equivalent control design. The population of all students in class X science with non-probability sampling was 36 students each. The instruments used were observation sheets, description questions, and questionnaires. The results showed that the average percentage of STEM-integrated problem-based learning implementation was 96.00% and 93.00% without STEM, both of which showed very good results. The average critical thinking ability of students in the STEM integrated problem-based learning class is 71% and 59% without STEM, this is shown by the average value of the STEM integrated problem-based learning classes is greater than without STEM. The linear regression test using STEM integrated problem-based learning has a positive effect on critical thinking skills 2.251, t-count > t-table (3.756 > 2.032), Ho is rejected Ha is accepted, and without STEM there is no effect on critical thinking skills, with a t-count