Validity and reliability estimation of assessment ability instrument for data literacy on high school physics material

Abstract

Assessment ability instrument for data literacy of physics material that's not accordance with characteristics of the assessment, it can make students less understanding of thermodynamics as a material of physics. Therefore, we need an assessment instrument developed according to Sumadi, which consists of multiple choice tests to determine the ability of data literacy in order to find out the quality of the content and empirical validity, the reliability of the assessment instrument. Analysis of the content validity that uses the Aiken V, the trial is analyzed through the MNSQ INFIT value, the estimated relability is expressed by the Cronbach alpha coefficient, Item Response Theory (IRT) seen through the total information function and Standard Error Measrument (SEM). The results of this study indicate that the instrument for assessing data literacy ability is valid with a V Aiken value> 0.8 and MNSQ INFIT parameter 1.00 ± 0.06. Estimation of the Cronbach alpha coefficient value is 0,93. The results obtained are based on the total information function curve and the instrument is reliable to measure the ability of students in the range of -3 to +3. Based on the value of the information function, the ability of students is still low.