Tujuan penelitian ini untuk mengetahui pengaruh model Numbered Heads Together (NHT) Terhadap Keaktifan dan Pemahaman Konsep Biologi siswa Kelas XI IPA SMAN 2 Tarakan. Jenis penelitian ini adalah eksperimen semu (quasi ekspeiment) dengan desain penelitian Nonequvalent Control Group Design. Populasi dalam penelitian ini adalah seluruh siswa kelas XI IPA SMAN 2 Tarakan tahun ajaran 2015/2016 dan sampel sebanyak 2 kelas. Teknik pengambilan sampel menggunakan purposive sampling. Analisis data menggunakan bantuan software SPSS 22,0. Hasil analisis pengaruh penerapan model pembelajaran kooperatif tipe Numbered Heads Together (NHT) terhadap keaktifan dan pemahaman konsep, yang di analisis menggunakan MANOVA dan uji lanjutan menggunakan uji t pihak kanan (Independent Sample Test). Berdasarkan hasil analisis MANOVA uji Multivariat Test menunjukkan bahwa nilai signifikan keaktifan dan pemahaman konsep masing-masing 0,000 ( ttabel. Sehingga dapat disimpulkan Terdapat pengaruh penerapan model pembelajaran kooperatif tipe Numbered Head Together (NHT) terhadap keaktifan siswa. Sedangkan hasil uji lanjutan menggunakan uji t pihak kanan (Independent Sample Test) untuk nilai pemahaman konsep di peroleh thitung sebesar 0,097 pada taraf signifikansi α = 0,05 dan df = 62 diperoleh nilai ttabel 1,671 berarti thitung < ttabel. Dapat disimpulkan bahwa Tidak terdapat pengaruh penerapan model pembelajaran kooperatif tipe Numbered Head Together (NHT) terhadap pemahaman konsep biologi siswa.

Kata Kunci: Numbered Head Together (NHT), Keaktifan, Pemahaman Konsep

The purpose of this study is to determine the effect of the model Numbered Head Together (NHT) about activeness and understanding biology students of class XI IPA SMAN 2 Tarakan. The research is quasi-axperimental research design nonequivalent control group design. The population in this study are all students of class XI IPA SMAN 2 Tarakan 2015/2016 school year and a sample of 2 classes. The sampling technique used purposive sampling. Data analysis using SPSS 22.0 software. The result analysis of the influence from the application of cooperative learning model Numbered Head Together (NHT) to the activeness and understanding of the concept, which was analyzed using MNOVA and advanced test use the right side t test (Independent Sample Test). Based on the analysis of test MANOVA Multivariate Test showed that the activity of the significant value and understanding of each concept 0.000 ( ttabel. It can be concluded influences of the implementation of cooperative learning model Numbered Head Together (NHT) to active students. While the results of next test using the t test right side (Independent Sample Test) for the value of understanding the concept obtained thitung was 0.097 at significance level α = 0,05 and Df = 62 result 1,671 tabel values was obtained thitung < ttabel. It can be concluded that there were not effects of the application of cooperative learning model Numbered Head Together (NHT) to understanding of the concept of biological students. Keywords : Numbered Head Together ( NHT ) , Activiness , Concept Training .