Analysis of instrument validity to measure junior high school students' mathematical imagination

Abstract

The purpose of this study was to determine the validity of the instrument to measure the imagination of junior high school students. As for the stages carried out include: 1) conducting a literature study to get indicators of mathematical imagination ability, 2) preparing instruments based on the indicators obtained, and 3) testing the validity and readability test of the instruments that have been prepared. The readability test was conducted by 30 junior high students, while the validity test was conducted by 6 experts consisting of 2 learning experts in junior high school, 2 learning evaluation experts, and 2 mathematics education experts. Readability test results state that of the 12 items created, 6 questions can be understood by students, while the other 6 questions cannot be understood by students. Furthermore, 6 questions that can be understood by students were tested for validity. The test results show that 3 items are declared valid without revision, 3 items are declared to need revision. There is 1 item that needs to be revised answer key. The validator also provides suggestions to sort the questions from the easiest to the most difficult questions.