The Effect of Learning Model and Mathematical Ability into Student's Learning Outcomes in Evaluation Course of Chemistry Education State University of Medan

This quasi experimental study aims to investigate effect of Problem-based learning model and mathematical ability into student's learning outcome in Evaluation Course of Chemistry Education. About 2 classes of chemical education students in 2015 were involved in this study as total sample. They were taught by implementing problem Based Learning (PBL) and Direct Instruction (DI) model. This research is experimental research with factorial design 2 x 2. Data of student learning and mathematical ability were obtained by administering achievement test and mathematical ability test then were analyzed by using Analysis of Variance (ANOVA) two way (2x2) with significance level 0.05. The sample groups in this study have met the criteria of homogeneity and normality test. The results of this study showed: (1) PBL model gives better learning result (26.57 +/- 5.81) than DI model (24.04 +/- 2.86); (2) students with high mathematical ability gained higher average learning outcomes (26.08 +/- 4.23) rather than those with lower math skills (24.53 +/- 2.97); And (3) there is an interaction between the PBL model and the mathematical ability. This study concludes that students with high mathematical ability are suitable to be taught by PBL model while students with low mathematical ability with DI model.