I. Dwijayanti, I.K. Budayasa, T.Y.E. Siswono
Imagination has an important role as the center of sensorimotor activity of the students. The purpose of this research is to construct the instrument of students' mathematical imagination in understanding concept of algebraic expression. The researcher performs validity using questionnaire and test technique and data analysis using descriptive method. Stages performed include: 1) the construction of the embodiment of the imagination; 2) determine the learning style questionnaire; 3) construct instruments; 4) translate to Indonesian as well as adaptation of learning style questionnaire content to student culture; 5) perform content validation. The results stated that the constructed instrument is valid by content validation and empirical validation so that it can be used with revisions. Content validation involves Indonesian linguists, english linguists and mathematics material experts. Empirical validation is done through a legibility test (10 students) and shows that in general the language used can be understood. In addition, a questionnaire test (86 students) was analyzed using a biserial point correlation technique resulting in 16 valid items with a reliability test using KR 20 with medium reability criteria. While the test instrument test (32 students) to find all items are valid and reliability test using KR 21 with reability is 0,62. © Published under licence by IOP Publishing Ltd.
Department of Mathematics Education, Universitas PGRI Semarang, 24 East Sidodadi Street, Dr. Cipto-Semarang, Central Java, 50125, Indonesia; Department of Mathematics, Universitas Negeri Surabaya, 48 Ketintang Wiyata Street, Ketintang, Gayungan, Surabaya, East Java, 60231, Indonesia
