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WONNACOTT, T, H., WONNACTT, R, J. (). INTRODUCTORY STATISTICS FOR BUSINESS AND ECONOMICS (ed.1). New York: Wiley.

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WONNACOTT, THOMAS, H.., WONNACTT, RONALD, J.. "INTRODUCTORY STATISTICS FOR BUSINESS AND ECONOMICS". ed.1 New York: Wiley, . Text.