Leonard, J Martin
Understanding statistics
Teach Yourself Books, 1974
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Naiman, Arnold
Understanding statistics
McGraw-Hill, 1983
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McClave, James T.
Statistics
Prentice-Hall, 2000
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McClave, James T.
Statistics
Dellen Publishing, 1979
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Hays, William Lee, 1926-1995
Statistics
Harcourt Brace Colege, 1994
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