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*[https://www.cdc.gov/csels/dsepd/ss1978/index.html CDC Principles of Epidemiology]
*[https://www.med.soton.ac.uk/stats_eLearning/quizzes/index.html Statistics - University of Southampton]
*[https://collegedunia.com/exams/statistics-mcq-mathematics-articleid-4505]
==Types of variable==
