Abstract: This research was motivated by the less than optimal collaboration abilities of students. This can be seen from the lack of positive dependence between students in group assignments. Some students still tend to be alone, mischievous, or passive during group activities. This research aims to determine the effect of the Numbered Head Together (NHT) learning model on students' collaborative abilities in statistics material in class VII for the 2023/2024 academic year. This research uses an experimental method with a Quasi Experimental design in the form of a nonequivalent control group design. The research population was class VII students of SMP Negeri 1 Kotabumi for the 2023/2024 academic year, using a purposive sampling technique. The instruments used were questionnaires and authentic assessments, which were given before and after treatment. Based on the results of the t test analysis, t_(calculation)=2.638 and t_table=1.998 so that t_(calculation)> t_(table) then H_(0) was rejected by H_( 1) accepted. This means that there is an influence of the Numbered Head Together learning model on students' collaborative abilities in class VII statistics material at SMP Negeri 1 Kotabumi for the 2023/2024 academic year.

Keywords: Students' collaborative skills, Numbered Head Together (NHT), Statistics, Quasi-Experiment, SMP Negeri 1 Kotabumi

Abstrak: Penelitian ini dilatarbelakangi oleh kurang optimalnya kemampuan kolaborasi siswa. Hal ini terlihat dari kurangnya ketergantungan positif antar siswa dalam tugas kelompok. Beberapa siswa masih cenderung menyendiri, suka jahil, atau bersikap pasif selama kegiatan kelompok. Penelitian ini bertujuan untuk mengetahui pengaruh model pembelajaran Numbered Head Together (NHT) terhadap kemampuan kolaboratif siswa pada materi statistika di kelas VII tahun ajaran 2023/2024. Penelitian ini menggunakan metode eksperimen dengan desain Quasi Experimental dalam bentuk nonequivalent control group design. Populasi penelitian adalah siswa kelas VII SMP Negeri 1 Kotabumi tahun pelajaran 2023/2024, dengan teknik pengambilan sampel Purposive Sampling. Instrumen yang digunakan berupa angket dan penilaian autentik, yang diberikan sebelum dan sesudah perlakuan.Berdasarkan hasil analisis uji t diperoleh dan sehingga maka ditolak diterima. Hal ini berarti ada pengaruh model pembelajaran Numbered Head Together terhadap kemampuan kolaboratif siswa pada materi statistika kelas VII SMP Negeri 1 Kotabumi tahun Pelajaran 2023/2024.

Kata Kunci: Pengaruh Kemampuan kolaborasi siswa,Numbered Head Together (NHT), Statistika.