Can people really identify their favorite brand of cola? Volunteers tasted Coke, Pepsi, Diet Coke, and Diet Pepsi, with the results shown below. Research question: At α = .05, is the correctness of the prediction different for regular cola and diet cola drinkers? Since it is a 2 × 2 table, try also a two-tailed, two-sample z test for π1 = π2 and verify that z2 is the same as your chi-square statistic.

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Correct? Yes, got it right No, got it wrong Col Total Row Total 14 32 46 Reguiar Cola Diet Cola 12 20 27 19