Keller, Gerald. <br/><br/>
Statistics for management and economics / 
Gerald Keller, Brian Warrrack. 
 - 4th ed. 
 - Belmont, CA :  Duxbury Press,  c1997. 
 - xxviii, 1073 pages  ill. (some col.) ;  26 cm. +  2 computer disks (3 1/2 in.)