A nonparametric introduction to statistics / Charles H. Kraft and Constance van Eeden. Kraft, Charles H. (Charles Hall), 1924- Eeden, Constance van. Statistics. Probabilities. HA29 .K797 311 KRN Includes index. New York : Macmillan, c1968. c1968. 1968 Text x, 342 p. : eng