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Wonnacott, Thomas H., Wonnacott, Ronald J.. (1990). Introductory statistics, 5th ed. (5th ed.). New York: John Wiley & Sons.

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Wonnacott, Thomas H., Wonnacott, Ronald J.. Introductory statistics, 5th ed.. 5th ed. New York: John Wiley & Sons, 1990. Text.

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Wonnacott, Thomas H., Wonnacott, Ronald J.. Introductory statistics, 5th ed.. 5th ed. New York: John Wiley & Sons, 1990. Text.

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Wonnacott, Thomas H., Wonnacott, Ronald J.. Introductory statistics, 5th ed.. 5th ed. New York: John Wiley & Sons, 1990. Print.