Can people really identify their favorite brand of cola? Volunteers tasted Coke, Pepsi, Diet Coke, and Diet Pepsi, with the results shown below. Research question: At ? = .05, is the correctness of the prediction different for regular cola and diet cola drinkers? Because it is a 2 ? 2 table, try also a two-tailed, two-sample z test for ?₁ = ?₂ (see Chapter 10) and verify that z² is the same as your chi-square statistic.

Transcribed Image Text:

Correct? Diet Cola Regular Cola Row Total Yes, got it right No, got it wrong 10 16 18 14 32 24 24 48 Col Total