Hoel, Paul Gerhard, 1905-
Elementary statistics
John Wiley & Sons, 1962
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Bowley, Arthur
Elementary of statistics
Staples Press, 1948
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Freund, John E.
Modern elementary statistics
Pearson Education, 2007
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Freund, John E.
Modern elementary statistics
Prentice-Hall, 1980
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Levin, Jack
Elementary statistics in social research
Harper & Row, 1973
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