Ronald A. Fisher was "interested in application and in the popularization
of statistical methods and his early book ''Statistical Methods for Research Workers'', published in 1925, went through many editions and
motivated and influenced the practical use of statistics in many fields of
study. His ''Design of Experiments'' (1935) () statistical technique and application. In that book he
emphasized examples and how to design experiments systematically from
a statistical point of view. The mathematical justification of the methods
described was not stressed and, indeed, proofs were often barely sketched
or omitted altogether ..., a fact which led H. B. Mann to fill the gaps with a rigorous mathematical treatment in his well known treatise, ."〔Page 87: (alternate URL )〕