CESS is delivering a 4-week course on Experimental Methods for students at the Department of Politics and International Relations (DPIR) at the University of Oxford. CESS Director Ray Duch and affiliated graduate student Mats Ahrenshop provide an introduction, in the form of lectures and programming labs, to selected topics in the statistical theory and practice of experimental research. All teaching materials such as slides, R code, and solutions to problem sets are publicly available on https://github.com/mahrenshop/experimental_methods2020.