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Chi-square test for Independence-Favourite brand of cola

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Can people really identify their favorite brand of cola? Volunteer tasted coca-cola classic, Pepsi, Diet coke, and Diet Pepsi, with the results shown below. Research question: At a = .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 2x2 table, try also a two-tailed two sample z test )(1 =)(2

Correct Regular Cola Diet Cole Row Total

yes got it right 7 7 14
no got it wrong 12 20 32

Col Total 19 27 46.

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Solution Summary

The solution provides step-by-step method for the calculation of chi square test for independence. Formula for the calculation and Interpretations of the results are also included. Interactive Excel sheet is included. The user can edit the inputs and obtain the complete results for a new set of data.

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