Abstract
Self-confidence is very important for students to actualize their potential and information on the level of student confidence is very helpful for teachers as a basis for decision making, as well as providing feedback to improve the learning process. This study aims to investigate whether there is a positive and significant relationship between self-confidence and student mathematics achievement. This research uses quantitative research methods, namely ex post facto type with a population of VII grade students of SMP Puspita Tangerang which consists of 5 classes total 188 students. Determination of the number of samples looked at the table of Issac and Michael with α = 0.05 and obtained a sample of 123 students. The data analysis of this study used a high confidence level of 95%. Based on the results of the simple linear regression test, it is found that the equation Ŷ = 21,714 + 0,374x means that there is a positive and significant relationship between self-confidence and student mathematics achievement. Then, the simple correlation coefficient test result count.
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