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Statistics - Null and Alternate Hypothesis - Chi Square

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Can people really identify their favorite brand of cola? Volunteers tasted Coca-Cola Classic, Pepsi, Diet Coke, and Diet Pepsi, with the results shown below (see attachment). Research question: At α = .05, is the correctness of the prediction different for the two types of cola drinkers? Could you identify your favorite brand in this kind of test? (Data are from Consumer Reports 56, no. 8 [August 1991], p. 519).

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