IMPLEMENTATION OF PROBLEM BASED LEARNING (PBL) MODEL TO CRITICAL THINKING SKILLS AND OUTCOMES FOR STUDENT ON RATE REACTION MATERIAL

The purpose of this research are: 1) a difference in students critical thinking skills that learned with Problem
Based Learning model and Direct Instruction model; 2) the differences effect in level of critical thinking skills high and
low students that learned with Problem Based Learning model and Direct Instruction model on student learning
outcomes; and 3) contribution of critical thinking skills to student learning outcomes. The population in this study were
all of students class XI IPA at SMAN Medan. The sampling technique is purposive sampling. The samples is two schools
at SMAN Medan two classes each other. The research instrument is an objective test results are valid and reliable
learning and critical thinking skills test. Data analysis is done by using independent sample T-test, Two Way ANOVA
and Linear Regression test in SPSS 21. The results concluded that : 1) there are differences in the average value of the
critical thinking skills of students that learned with Problem Based Learning model at 81,00 more than in the Direct
Instruction model at 68.65; 2) there are differences in the influence of the critical thinking skills of high and low
students that learned with Problem Based Learning model and Direct Instruction model on student learning outcomes
(p = 0.000 < 0.05); and 3) the students critical thinking skills contribute to the learning outcomes of students about
39.7%.