Levin, Jack
Elementary statistics in social research
Harper & Row, 1973
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Hoel, Paul Gerhard, 1905-
Elementary statistics
John Wiley & Sons, 1962
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Blalock, Hubert M.
Social statistics
McGraw-Hill , 1981
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Johnson, Robert
Elementary statistics
PWS-Kent, 1984
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Bowley, Arthur
Elementary of statistics
Staples Press, 1948
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