Analisis rasch instrumen literasi sains berbasis carbon dots pada fisika modern
DOI:
https://doi.org/10.59923/sendja.v4i3.981Keywords:
Literasi Sains, Model Rasch, Fisika Modern, Black Pepper Carbon Dots, FluoresensiAbstract
Pembelajaran Fisika Modern menuntut peserta didik memahami konsep abstrak, seperti energi foton, absorpsi, emisi, dan fluoresensi, serta menafsirkan data ilmiah. Penelitian ini mengevaluasi kualitas pengukuran instrumen literasi sains berbasis konteks Black Pepper Carbon Dots (BPCDs) menggunakan Model Rasch dikotomus. Kontribusi penelitian terletak pada pengaitan konteks fluoresensi BPCDs dengan pemetaan psikometrik butir literasi sains, bukan pada penemuan material baru. Penelitian melibatkan 124 peserta didik kelas XII dari empat kelas di SMA Negeri 17 Garut dan menggunakan 20 butir soal dikotomus. Observasi pembelajaran dan wawancara guru digunakan sebagai data kontekstual. Analisis dilakukan dengan WINSTEPS versi 3.73 melalui reliabilitas person dan item, separation, infit-outfit MNSQ, point-measure correlation, ukuran logit, serta Test Information Function. Hasil menunjukkan person reliability 0,81, item reliability 0,96, Cronbach Alpha/KR-20 0,84, person separation 2,05, dan item separation 5,01. Nilai infit MNSQ berada pada rentang 0,85-1,15, outfit MNSQ 0,56-1,21, dan point-measure correlation 0,32-0,61. Butir termudah adalah S1 (-2,25 logit), sedangkan butir tersulit adalah S19 (2,19 logit). Informasi tes mencapai puncak sekitar 0 logit dan menurun pada kedua ujung skala kemampuan. Temuan ini memberikan bukti awal tentang konsistensi pengukuran dan urutan tingkat kesulitan butir, validasi pada sekolah yang lebih beragam serta penguatan presisi pada kemampuan ekstrem masih diperlukan.
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