THE EFFECT OF PROBLEM- BASED LEARNING ON CRITICAL THINKING AND STUDENT ACHIEVEMENT IN THE 1 BANTUL SENIOR HIGH SCHOOL

The purposes of this study are (1) to know the effect of Problem-Based Learning on critical thinking, (2) to know the effect of Problem-Based Learning on student achievement, (3) to know the relationship between critical thinking and student achievement in Environmental Pollution of 10th Grade in The 1 Bantul Senior High School. The research was quasi experimental research using a control group pretest-posttest design. Sample was X IPA 5 as an experimental group while X IPA 6 as a control group. Data analysis techniques were normality and homogeneity test, t test, analysis of covariance (ANACOVA), and Pearson correlation. The results show that (1) Problem-Based Learning affects critical thinking, (2) Problem-Based Learning affects student achievement, and (3) there was a significant relationship between critical thinking and student achievement. The higher critical thinking is, the higher student achievement of the students