A graphical method for the rapid calculation of biserial and point biserial correlation in test research

Pandemi Covid-19 telah mengubah semua bidang salah satunya dibidang pendidikan. Guru dan siswa dituntut untuk belajar dari rumah melalui pembelajaran online, hal ini berpengaruh pada rasa percaya diri dalam belajar. Penelitian ini dilatarbelakangi oleh banyaknya temuan penurunan hasil belajar matematika siswa dari hasil observasi awal penelitian. Sehingga penelitian ini dilakukan dengan tujuan mengetahui pengaruh penggunaan metode pembelajaran demonstrasi dan metode drill. SD Cenderawasih 2 Jakarta kelas IV semester genap tahun ajaran 2019-2020 sebagai tempat melakukan penelitian. Metode eksperimen digunakan dalam penelitian ini. Populasi penelitian yaitu seluruh siswa kelas IV, kemudian dipilih sampel secara acak. Kelas eksperimen terdiri dari 30 sampel dan kelas kontrol sebanyak 30 siswa. Intrumen penelitian telah dilakukan uji validitas dengan rumus Point Biserial Correlation didapat 30 soal yang valid dan uji reliabilitas, sementara uji reliabilitas menggunakan KR-20 diperoleh hitung tabel r = 0,894  0,361 = r . Kedua data dilakukan uji lanjutan yaitu normalitas maupun uji homogenitas. Hasil uji normalitas pada kelas eksperimen diperoleh Lhitung =  161 = Ltabel 0,110 0, sementara kelas kontrol Lhitung =  161 = Ltabel 0,063 0, , sehingga kedua sampel dapat disimpulkan berdistribusi normal. Hasil perhitungan uji homogenitas dihasilkan Fhitung =  861 = Fkritis 1,095 1, , sehingga kedua kelas tersebut dapat disimpulkan mempunyai varians homogen. Hasil pengujian hipotesis dengan uji–t didapat hitung kritis t = 2,389  2,002 = t taraf signifikansi  = 0,05 serta derajat kebebasan (dk) = 58. Maka tolak H0, sehingga hasil penelitian mengambil kesimpulan bahwa ada pengaruh terhadap hasil belajar matematika menggunakan metode demonstrasi dan metode drill.

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DIVERSIFICATION OF REASONING SCIENCE TEST ITEMS OF TIMSS GRADE 8 BASED ON HIGHER ORDER THINKING SKILLS: A CASE STUDY OF INDONESIAN STUDENTS

Journal of Baltic Science Education ◽

10.33225/jbse/18.17.152 ◽

2018 ◽

Vol 17 (1) ◽

pp. 152-161

Author(s):

Anjar Putro Utomo ◽

Erlia Narulita ◽

Kinya Shimizu

Keyword(s):

Test Item ◽

Higher Order Thinking ◽

Thinking Skills ◽

Higher Order ◽

Science Class ◽

Higher Order Thinking Skills ◽

Test Items ◽

Point Biserial Correlation ◽

Biserial Correlation ◽

Science Test

The aim of this research was to assess the classification of science test items of TIMSS grade 8 based on higher order thinking skills (HOTS) and determine whether those classified-science test items can be an assessment tool in science class. Sixteen sample test items of HOTS were chosen from 37 reasoning items of TIMSS 1999, 2003, and 2011; which were 6 of analysing, 6 of evaluating, and 4 of creating. The selected items were tested to 410 ninth grade students in 14 public schools in Jember, Indonesia. Data were analysed by using point-biserial correlation to measure the index of discrimination and degree of difficulty at items of each level of HOTS test. The result revealed that the point-biserial index of discrimination for each item was higher than 0.25. The degree of difficulty of analysing, evaluating and creating test items exhibited a similar trend, which was in good range. Each test item has significant validity. Whilst reliability analysis showed that each test item was acceptable and indicating a high level of internal consistency. In conclusion, the classified science test items of TIMSS are good to use as assessment tools to measure HOTS of students in science class. Keywords: higher order thinking skills, point biserial correlation, science test items.

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