AbstrakPelaksanaan pembelajaran Biologi di kelas XI SMA Al-Kautsar Bandar Lampung kurang melatih dan membiasakan peserta didik untuk berpikir kritis. Hal tersebut menyebabkan kemampuan berpikir kritis biologi yang dimiliki peserta didik masih rendah. Berkenaan dengan masalah tersebut, maka penulis tertarik untuk melakukan penelitian di SMA Al-Kautsar Bandar Lampung pada kelas XI semester genap Tahun Ajaran 2015/2016 untuk mengetahui apakah terdapat pengaruh strategi pembelajaran peningkatan kemampuan berpikir (SPPKB) terhadap kemampuan berpikir kritis biologi peserta didik.Penelitian ini merupakan penelitian quasy experimental design dengan rancangan posttest only control design. Populasi penelitian ini adalah peserta didik kelas XI SMA Al-Kautsar Bandar Lampung. Sampel yang digunakan sebanyak 2 kelas yang dipilih dengan teknik acak kelas, yaitu kelas XI IPA 1 sebagai kelas eksperimen dan kelas XI IPA 4 sebagai kelas kontrol. Teknik pengumpulan data dengan tes berbentuk uraian, wawancara dan dokumentasi. Analisis data yang digunakan adalah uji-t.Berdasarkan hasil analisis data dan pengujian hipotesis yang telah dilakukan maka dapat disimpulkan bahwa terdapat pengaruh yang signifikan strategi pembelajaran peningkatan kemampuan berpikir (SPPKB) terhadap kemampuan berpikir kritis biologi peserta didik kelas XI di SMA Al-Kautsar Bandar Lampung. Hal ini dapat dilihat dari perhitungan menggunakan rumus Polled Varians menunjukkan bahwa yaitu, 6,115 > 1,671. Sehingga H0 ditolak dan H 1 diterima. Kata Kunci : Strategi pembelajaran peningkatan kemampuan berpikir (SPPKB)Kemampuan berpikir kritis biologi, Sistem reproduksi manusia.ABSTRACT Implementation of Biology learning in class XI SMA Al-Kautsar Bandar Lampung less to train and familiarize learners to think critically. This causes critical thinking skills possessed biological learners still low. With regard to the problem, the authors are interested in doing research in SMA Al-Kautsar Bandar Lampung in class XI Academic 68Year 2015/2016 second semester to determine whether there is influence learning strategy for improving the ability to think (SPPKB) the ability to think critically biology students.This study is quasy experimental design with draft posttest only control design. The study population was the students of class XI SMA Al-Kautsar Bandar Lampung. Samples are 2 classes selected by random technique classes, classes that used as the experiment is the class XI IPA 1 and class XI IPA 4 as the control class. Data collection techniques used are descriptions shaped test, interviews and documentation. Analysis of the data used is the t-test.Based on the results of data analysis and hypothesis testing has been done it can be concluded that there is significant influence learning strategy for improving the ability to think (SPPKB) the ability to think critically biology class XI students in SMA Al-Kautsar Bandar Lampung. It can be seen from the calculation using the formula polled variance showed that thitung > ttabel, 6.115> 1.671. So that H0 and H1 accepted. Key Word...
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