Tippett, L.H.C.
The methods of statistics
Williams and Norgate, 1952
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Chao, Lincoln L.
Statistics : methods and analysis
McGraw-Hill, 1974
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Coolican, Hugh
Research methods and statistics in psychology
Hodder & Stoughton, 2009
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Coolican, Hugh
Research methods and statistics in psychology
Psychology Press, 2014
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Johnson, Palmer O.
Modern statistics methods : descriptive and inductive
Rand McNally, 1959
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