Johnson, Palmer O.
Modern statistics methods : descriptive and inductive
Rand McNally, 1959
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Fisher, Ronald A.
Statistics methods for research workers / by Ronald A. Fisher
Oliver and Boyd , 1950
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Fraser, D.A.S.
Statistics: an introduction
John Wiley & Sons, 1967
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Langley, Russell
Practical statistics simply explained
Dover , 1971
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Yamane, Taro
Statistics : an introductory analysis
New York University, 1967
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