The need for advanced mathematics is a compulsory course in applied psychology. There are probability theory, psychostatistics, psychometrics and so on. Expansion: About Applied Psychology Applied psychology is an important branch of psychology that develops rapidly. Because of people's needs in work and life, the related research fields of various topics have formed the discipline of psychology. Applied psychology studies the application of the basic principles of psychology in various practical fields, including industry, engineering, organization and management, market consumption, school education, social life, medical care, sports, military affairs, justice, environment and other fields. With the rapid development of economy, science and technology, society and culture, the prospect of applied psychology is more and more broad.