Can people really recognize their favorite brand of cola? Volunteers tasted Coca-Cola Classic, Pepsi, Diet Coke, and Diet Pepsi, with results shown below. Research question: At _ = .05, is the correctness of prediction different for two types of cola drinkers? Could you recognize your favorite brand in this type of test? Since it is a 2 _ 2 table, try also the two-tailed two-sample z test for ð1 = ð2 and verify that z2 is the same as your chi-square statistic. Which test do you prefer?Why?
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Correct?
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Regular Cola
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Diet Cola
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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
|
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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