A Construct Validity of Spatial Literacy Instrument

Abstract

To measure spatial literacy skills, a good instrument is needed. Therefore, this study aims to 1) compile the construct of a spatial literacy ability test instrument for prospective mathematics teacher students, 2) to do validation of the construct to see the index of validity and reliability. Content validation using the V Aiken formula and the Cronbach Alpha coefficient were used to test the validity and reliability. The results showed that: 1) the construct of spatial literacy in the form of operational definitions, six indicators, 17 sub indicators and 34 questions in the form of multiple choices has shown a form of spatial concept integration with literacy, 2) spatial literacy test instruments are feasible because they meet index validity requirements V Aiken between 0.67-0.89. The test kit also states fit for 34 items, because it is in the acceptance limit range of >0.77 to <1.30. In addition, the level of difficulty on the test using a logit scale that produces 13 categorized items is very easy, 6 items are easy, and 15 items are difficult. In the study, the value of reliability was 0.704 (> 0.5). While the Standard Error of Measurement (SEM) which is a value that measures how precise the value obtained is equal to 1.287. Henceforth, this test kit can be used by the academic community at universities or other agencies concerned to measure the level of spatial literacy of prospective mathematics teachers.