The aim of the study is to test the effect of the Diagnostic Assessment For Basic Competencies Mastery synthesizing the State Institution Authority according to the Constitution of Indonesia Year 1945. The population of this study were students from X class of SMA Batik 1 Surakarta. The sample were X MIPA 4 class as the experiment class which use the Diagnostic Assessmentand X MIPA 3 class which use the conventional assessment through cluster random sampling technique. This research used experimental method with true-experimental design. The data collection was conducted by using test techniques to measure the basic competencies mastery, observations in the Diagnostic Assessment and document analysis techniques to gather the data on the PPKn RPP to complete the data. The data analysis using two differentation in T-test sample, while requirement test analysis using normality test and homogeneity test. The results of this research is there are differences in basic competencies mastery of students in the experimental class in the X MIPA 4 class with a basic competencies mastery of students in the control class in the X MIPA 3 class. The score of basic competencies mastery obtained from the average grade of 84.15 in experimental class and 72.35 in control class. It can be shown in the calculation of t_hitung amounted to 5,558. T_tabel then compared with the significance level of 5% amounting to 1,992 and obtained t_hitung > t_tabel, namely 5.558 > 1.992. in conclusion t_hitung > t_tabel, so H_0 rejected and H_a accepted. Therefore, it can be concluded that there are significant differences in the influence of the Diagnostic Assessment to the basic competencies mastery on synthesizing the State Institution Authority according to the Constitution of Indonesia Year 1945.
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