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References
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Costis
H. G.
, Statistics for Business (Columbus, Ohio : C. E. Merrill Co. , 1972 ), pp. 192 –193 .
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Freund
J. E.
Williams
F. J.
, Elementary Business Statistics: The Modern Approach , 2d ed. (Englewood Cliffs, N.J. : Prentice-Hall , 1973 ), p. 400 .