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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 problem: At α .05, is correctness of the prediction different for the two kinds of cola drinkers?

Could you recognize your favorite brand in this kind of test?  

Since it is a 2 × 2 table, try as well a two-tailed two-sample test for π1 = π2 and verify that z2 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
column total 19 27 46

Statistics and Probability, Statistics

  • Category:- Statistics and Probability
  • Reference No.:- M922142

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