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Hoel, Paul G.. (S.a.). Elementary Statistics (Ed. 40. --). New York: John Wiley & Sons.

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Hoel, Paul G.. Elementary Statistics. Ed. 40. -- New York: John Wiley & Sons, S.a.. Text.

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Hoel, Paul G.. Elementary Statistics. Ed. 40. -- New York: John Wiley & Sons, S.a.. Text.

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Hoel, Paul G.. Elementary Statistics. Ed. 40. -- New York: John Wiley & Sons, S.a.. Print.