VALIDITAS TES KEMAMPUAN BERPIKIR KRITIS SISWA PADA MATERI EKOLOGI KELAS X MIPA SMA 1 N BINTAN
This study aims to determine students critical thingking skills. This research uses a quantitative approach with a descriptive method carried out at SMA Negeri 1 Bintan in the 2019/2020 school year. In this study, the instrument in the form of a test whose validity was tested was given to 30 student of grade 11 MIPA SMA N 1 Bintan. The instrument consist of 22 items. On the validity of the best instrument calculation with the help of software 21.0 the validity test use the formula belonging to the product person when going through r, namely rcount>rtabel with a significant level of 5%. The validity result obtained from the test instrument were 0.245, which means the questions were declared valid.