Sarjono, Djemari Mardapi, Mundilarto
The purpose of this research was to develop a valid, reliable instrument with good difficulty indices for Physics lab test on Senior High School level. By applying research development (R & D) design, data were collected through observation, test and project assessment in the form of three categories of polytomous data. The research subject was 505 respondents studying at grade XI-MIA of Public and Private High Schools in Pemalang. The data obtained were analyzed by using three programs, namely Quest program to verify model suitability and difficulty index level, and Parcale program to obtain information function and Standard Error of Measurement (SEM). Confirmatory Factor Analysis using Lisrel program was applied to measure the construct validity of the instrument. Results yielded that the construct of physics lab test instrument at senior high school level consisted of 4 factors, namely (1) preparation of practicum, (2) practicum, (3) practicum results (4) practicum reporting. Developed instruments were valid and reliable, and suitable to be applied to learners who have medium ability. The implications of this study are that the assessment becomes more fair and accurate because assessment is done from the preparation until the lab report. © 2018 International Journal of Instruction.
Student of Post Graduate Program, Yogyakarta State University, Indonesia; Assessment and Evaluation Education Department, Yogyakarta State University, Indonesia; Physics Education Department, Yogyakarta State University, Indonesia
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