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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. 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? Since it is a 2 × 2 table, try also a two-tailed two-sample
    z test for π1 = π2 (see Chapter 10) and verify that z2 is the same as your chi-square statistic.Which
    test do you prefer? Why? (Data are from Consumer Reports 56, no. 8 [August 1991], p. 519.)

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