ABSTRAK
Penelitian ini bertujuan untuk: (1) mengetahui ada tidaknya perbedaan pengaruh antara model pembelajaran blended learning dan kooperatif tipe Team Assisted Individualization (TAI) terhadap kemampuan kognitif IPA siswa kelas VII SMP Negeri 15 Surakarta, (2) mengetahui ada tidaknya perbedaan pengaruh antara komunikasi ilmiah kategori tinggi, sedang, dan rendah terhadap kemampuan kognitif IPA siswa kelas VII SMP Negeri 15 Surakarta, (3) mengetahui ada tidaknya interaksi model pembelajaran melalui blended learning dan Kooperatif tipe Team Assisted Indivualization (TAI) dengan komunikasi ilmiah terhadap kemampuan kognitif IPA siswa kelas VII SMP Negeri 15 Surakarta.
Jenis penelitian ini adalah penelitian eksperimen dengan desaign faktorial 2x3. Di mana faktor A merupakan model pembelajaran dan faktor B merupakan komunikasi ilmiah siswa. Populasi penelitian ini adalah siswa kelas VII SMPN 15 Surakarta. Pengambilan sampel dilakukan dengan teknik cluster random sampling dengan sampel penelitian yaitu kelas VII-A dan VII C. Pengumpulan data dilakukan dengan teknik tes dan teknik observasi. Analisis data dilakukan dengan ANAVA dua jalan dan uji lanjut ANAVA.
Berdasarkan analisis data dapat disimpulkan bahwa : (1) ada perbedaan pengaruh antara model pembelajaran blended learning dan kooperatif tipe Team Assisted Individualization (TAI) terhadap kemampuan kognitif IPA siswa kelas VII SMP Negeri 15 Surakarta, karena Fa = 12, 97 > F0,05;1;54 = 4,02. (2) ada perbedaan pengaruh antara komunikasi ilmiah kategori tinggi, sedang, dan rendah terhadap kemampuan kognitif IPA siswa kelas VII SMP Negeri 15 Surakarta, karena Fb = 4,59  > F0,05;2;54 = 3,17. Komunikasi ilmiah siswa kategori tinggi memberikan pengaruh lebih baik daripada komunikasi ilmiah siswa kategori sedang, sebab F1-2¬ = 12,10 > Ftabel = 6,34. Komunikasi ilmiah siswa kategori tinggi memberikan pengaruh lebih baik daripada komunikasi ilmiah siswa kategori rendah, sebab F1-3¬ = 17,38 > Ftabel = 6,34. Komunikasi ilmiah siswa kategori sedang memberikan pengaruh hampir sama dengan komunikasi ilmiah siswa kategori rendah, sebab F2-3 = 2,79 < Ftabel = 6,34  (3) tidak ada interaksi model pembelajaran melalui blended learning dan Kooperatif tipe Team Assisted Indivualization (TAI) dengan komunikasi ilmiah terhadap kemampuan kognitif IPA siswa kelas VII SMP Negeri 15 Surakarta, karena Fab = 2,55  < F0,05;2;54 = 3,17.
Kata kunci: blended learning, kooperatif, team assisted individualization, hujan asam, kognitif, komunikasi ilmiah
ABSTRACT
The purpose of this research was to find out the difference impact between blended learning model and type cooperative of Team Assisted Individualization (TAI) toward cognitive ability of surakarta state junior high school no. 15 student grade VII-Science Program, to find out the difference impact between scientific communication of high,medium,and low categories toward cognitive ability of surakarta state junior high school no. 15 student grade VII-Science Program, to find out the interaction learning model through blended learning and type cooperative of Team Assisted Individualization (TAI) toward cognitive ability of surakarta state junior high school no. 15 student grade VII-Science Program .
Type of this research was experimental research with 2x3 factorial design. Factor A was learning model and factor B was scientific communication of student. The population was seventh grade students of SMPN 15 Surakarta. Sampling was done by cluster random sampling technique with research sample were class VII-A and VII-C.The data collected by test and observation. Data analized by two ways ANOVA and a further test ANOVA.
Based on the result of data analysis, it can be concluded: (1) there was the difference impact between blended learning model and type cooperative of Team Assisted Individualization (TAI) toward cognitive skill of surakarta state junior high school no. 15 student grade VII-Science Program, because Fa = 12, 97 > F0,05;1;54 = 4,02. (2) there was the difference impact between scientific communication of high, medium, and low categories toward cognitive ability of surakarta state junior high school no. 15 student grade VII-Science Program, because Fb = 4,58  > F0,05;2;54 = 3,17. Communication students high category provide a better influence than student scientific communication medium category, because F1-2 = 12.10 > 2F table = 6.34. Scientific communication students high category provides a better effect than scientific communication students lower category, because F1-3= 17.38 > 2F table = 6.34. Scientific communication students in medium category were almost had the same effect with scientific communication students in lower category because F2-3 = 2,79 < 2F table = 6.34 (3) there was no the interaction in learning model through blended learning and type cooperative of Team Assisted Individualization (TAI) toward cognitive ability of surakarta state junior high school no. 15 student grade VII-Science Program, because Fab = 2,54  < F0,05;2;54 = 3,17.
Keyword: blended learning, cooperative, team assisted individualization, acid rain, cognitive, scientific communication