Levin, Jack
Elementary statistics in sosial research
Harper Collins, 1991
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McCormick, Thomas Carson, 1892-
Elementary Social Statistics
McGraw-Hill, 1941
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Healey, Joseph F., 1945-
Statistics : a tool for social research
Cengage Learning, 2015
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Weiss, Robert S.
Statistics in social research : an introduction
N.Y. Wiley , 1968
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Healey, Joseph F., 1945-
Statistics : a tool for social research
Wadsworth, 1996
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