371.2 R Rugg, Harold Odway , 1886- Statistical methods applied to education ; a textbook for students of education in the quatitative sudy of school problems , by Harold O. Rugg. Boston , New York (etc.) Houghton Mifflin company (c1917) xviii , 410 p. ilus. , from. , diagrs. 19 cm ( Half- title : Riverside textbooks in education , ed. by E. P. Cubberley) Bibliography : p. (361)-378