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This video explains the types of statistical hypothesis, which are divided into two types: The null hypothesis H0 The alternative hypothesis H1 The alternative hypothesis is divided into 03 types: 1- An alternative hypothesis with two sides or two tails or not directed. 2- An alternative hypothesis with a right side or a right tail or directed to the right. 3- An alternative hypothesis with a left side or a left tail or directed to the left. 1)- Our Facebook page: / iorikader 2)- Our YouTube channel: / thekader30 3)- Email: [email protected] Dr. Abane Abdelkader PhD in Sociology of Management and Labor Lecturer in the Department of Sociology and Demography Faculty of Humanities and Social Sciences - University of Ouargla - Algeria