Can people really recognize their favorite brand of cola? Volunteers tasted CocaCola Classic, Pepsi, Diet Coke, and Diet Pepsi, with results shown below. Research problem: 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 twotailed twosample z test for ð1 = ð2 and verify that z2 is the same as your chisquare 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

Column Total

19

27

46
