<![CDATA[The purpose of this study was to determine the effect Effects of Problem Based Learning (Problem Based Learning) Critical Thinking Ability Of Students In Biology Lesson In Class X MA NW Kotaraja academic year 2014/2015. This type of research is experimental research. Data collection techniques to study the results of the essay test method. The research hypothesis testing using t-test is parametric with a significant level of 5%. Based on calculations for analysis prerequisite test that normality test can be concluded that the two samples come from populations with normal distribution because χ2hitung ≤ χ 2tabel, namely for the experimental class ≤ 6.563 and 11:07 a.m. to 11:07 a.m. ≤ 7,271 control class. As for the homogeneity test can be concluded that the samples come from a homogeneous population because Fhitung Ftable is 1:04 1.86. From the analysis of the test showed that the hypothesis H0 is rejected and Ha accepted as the price of -thitung ≤ - T1 values / 2α or thitung ≥ t1 / 2α, namely 4.365 ≥ 2.002. . It can be concluded that the influence of Influence There is Problem Based Learning (Problem Based Learning) Critical Thinking Ability Of Students In Biology Lesson In Class X Kotaraja NW MA Academic Year 2014/2015.]]>
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