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... +/>*) +% 0 +/BC 135 Effects of mastery learning on academic achievement and attitudes toward statistics in psychology students Mozafar darvishi 1 Ali Akbar Seif 2,* Hassan Ahadi 2 1: Ph.D. Student in Educational Psychology, Islamic Azad University, Science and esearch Branch of Tehran, Iran. 2: Faculty Member, of Educational Psychology, Islamic Azad University Science and esearch Branch, Tehran, Iran. Abstract: The aim of this study was to compare the effects of mastery learning with conventional approaches on academic achievement and attitudes toward statistics. The research method is quasiexperimental. And the research design is a pretest posttest with control group. The population consisted of all students of psychology. Multistage cluster random sampling was sampling method. Then a sample of 44 students was selected. They were assigned randomly 24 students in the control group and 20 students in the experimental group. Initially pretest scores of students were measured through tests inferential statistical and scale of attitudes toward statistics. The experimental groups were taught during 10 sessions through mastery learning method, and control group through conventional methods.at the end of the posttest scores obtained from both groups. esults multi covariance and independent t test shows mean advances in Statistics and the components attitude towards Statistics in the experimental group were significantly higher than the control group. The experimental group students with possession tasks with hierarchical structure both were mastered prerequisite to learning and also received the instruction the quality of education appropriate to their individual characteristics. Keywords: Mastery Learning, Inferential Statistics and Attitudes Towards Statistics, Academic Achievement. *Corresponding author: Ph.D. Student in Educational Psychology, Islamic Azad University, Science and esearch Branch of Tehran, Iran. Email: aliakbarsaif@yahoo.com 1396$% 1