Can people really identify their favorite brand of cola

Question

Discuss the below:

Q: 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 alpha = .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 pi1 = pi2  and verify that π² is the same as your chi-square statistic. Which test do you prefer? Why

Correct?            Regular cola   Diet cola    Row total
Yes,got it right     7                  7          14
No, got it wrong   12                20         32
Col Total             9                 27          46