CONSTRUCT VALIDITY OF CRITICAL THINKING SKILL INSTRUMENT IN TEACHING MATHEMATIC IN JUNIOR HIGH SCHOOL

摘要

This study aims to evaluate the construct validity of cognitive instruments of critical thinking in teaching mathematics in junior high school. The instrument was developed using a method that allows to design an obvious question to measure both the content and critical thinking skills. Critical thinking instrument consists of 42 multiple choice questions with four alternative choices. The study involved 656 students from junior high school in Yogyakarta. The findings indicate that critical thinking has satisfactory construct validity by five factors extracted and confirmed by confirmatory factor analysis. CFA revealed the model fit. (CFI = 0.97; RMSEA = 0.059; IFI = .0.97; PNFI = 0.90, and 2/ df =3.10)ududKeywords: construct validity, critical thinking