"On the problem of the most efficient tests of statistical hypothesis"; Royal Society Paper 1933 Bundle (numbered 3) of MS and TS notes and diagrams for Neyman and ESP's paper "The problem of the most efficient tests of statistical hypothesis" published by the Royal Society in Philosophical Transactions of the Royal Society in 1933. Includes TS copies of some letters from JN to ESP (a list of these letters made by ESP is found at the beginning of the file). This paper introduced the concept of the 'Neyman-Pearson Lemma'. c1931-1933