Programmed learning aid for business and economic statistics / Robert D. Mason. Coordinating editor, Roger H. Hermanson. Mason, Robert D. Hermanson, Roger H. Statistics Programmed instruction. 311 MAP Includes index. Homewood, Ill. : Learning Systems, c1978. c1978. 1978 Text xi, 166 p. : eng Irwin Programmed learning aid series.