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1
Statistics for business and economics / Paul Newbold, William L. Carlson, Betty M. Thorne.
Englewood Cliffs, N.J. : Prentice-Hall, c1984.
xvi, 895 p. : ill. ; 24 cm.
2
Statistics for business and economics : methods and applications / Edwin Mansfield.
New York : Norton, 1980
xviii, 580, 94 p. : ill. ; 25 cm.