Penelitian ini dilaksanakan mulai bulan mei 2015 di sma negeri 2 tarakan. jenis penelitian ini adalah eksperimen semu dengan desain penelitian posttest only non equivalent control group design. populasi dalam penelitian ini adalah siswa kelas x ipa dan sampel sebanyak dua kelas. pengambilan sampel dilakukan dengan teknik random sampling. analisis data menggunakan bantuan software spss 16.0 for windows dengan teknik analisis menggunakan uji independent sample t-test. analisis data posttest dengan menggunakan uji-t diperoleh hasil menunjukkan thitung (2,252) lebih besar dibandingkan ttabel (1,669). berdasarkan hasil analisis data dapat disimpulkan bahwa terdapat pengaruh penerapan model pembelajaran problem based instruction disertai dengan media audio visual terhadap kemampuan berpikir pada kritis siswa kelas x sma negeri 2 tarakan.

This research was conducted on may 2015 at sman 2 tarakan. kind of this research is quasi-experimental with the research design is posttest only non-equivalent control group design. population of this research was the the students of class x ipa and the sample was about two classes. the sample was taken by using random sampling technique. the data analysis was done by using software spss 16.0 for windows and technique of analyzing the data was done by using independent sample t-test. data analysis was posttest by using t-test and the result of data analysis showed that t arithmetic (2,252) is higher than t table (1,669). based on the results of data analysis it concluded be that there are is effect of using problem based instruction learning model combined with audio visual media on the critical thinking ability in class x sma negeri 2 tarakan.