Question: Can people really identify their favorite brand of cola? Volunteers tasted Coca-Cola Classic, Pepsi, Diet Coke, & Diet Pepsi, with the results shown below. Research question: At α = .05, is the correctness of the prediction different for the 2 types of cola drinkers? Could you identify your favorite brand in this kind of test? Since it is a 2 x 2 table, try also a two-tailed two-sample z test for n^^ = n2 & verify that z, is the same as your chi-square statistic. Which test do you prefer? Explain your answer.
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Correct?
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Regular
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Cola Diet
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Cola Row Total
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Yes, got it right
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7
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7
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14
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No, got it wrong
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12
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20
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32
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Column Total
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19
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27
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46
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