Elementary statistical methods [by] G. Barrie Wetherill. Wetherill, Barrie. Mathematical statistics. QA276 .W454 311 WEE Label mounted on t.p.: Distributed in the United States by Barnes & Noble. Bibliography: p. 321-324. London, Methuen, 1967. 1967. 1967 Text iii-xiii, 15-329 p. eng