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## Statistics

Chi-square for independence of attributes.

Can people really make out their favourite brand of cola? Volunteers tasted Coca-Cola Classic, Pepsi, Diet Coke, and Diet Pepsi, with the results shown below. Research problem: At _ = .05, is the correctness of the prediction different for the two types of cola drinkers? Could you recognize your favourite brand in this kind of test? Since it is a 2 _ 2 table, try also a two-tailed two-sample z test for ð1 = ð2 and confirm 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.:- M918215

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