摘要：This study applied mixed methods with concurrent triangulation design that
combines quantitative and qualitative research method in a balanced manner and
convergence. Population in this study was as 188 students of 8th grade in a state
junior high school in Semarang City, Indonesia. By using purposive sampling
technique, 60 students were selected as the research subjects. The study aimed to
observe the effect of mathematical disposition on students’ mathematical power
ability, and to describe how dispositional mental functions work when
mathematical disposition is developed. Data was collected through written test
(essay), questionnaires, observation and interview. Data of research result was then
analyzed quantitatively (with analysis of variance) and qualitatively (analysis of
interactive model). On the final stage, meta-analysis on the data was conducted.
Based on the analysis of quantitative and qualitative data, it could be found that:
(1) There was an effect of mathematical disposition (X) on mathematical power
ability (Y) by regression equation model Y =37.106 + 0.567X which was linear on
significance level = 0.05. (2) The teachers should optimize the dispositional mental
functions of the students by selecting a learning model that could develop the
cognitive, affective, and conative competencies together.
