A few years ago, Pepsi invited consumers to take the "Pepsi Challenge." Consumers were asked to decide which of two sodas, Coke or Pepsi, they preferred in a blind taste test. Pepsi was interesting in determining what factors played a role in people's taste preferences. One of the factors studied was the gender of the consumer. Data on the percentage of men and women depicting preference for Pepsi were collected. Which of the following tests will you use to find out if there is any difference in preference between the different gender groups?
A) McNemar test
B) Paired t test
C) Z test for difference in proportions
D) Wilcoxon rank sum test

Question

Quizplus · Accepted Answer

The Z test for difference in proportions is used when the data involves two samples and we want to compare the proportions of success between the two samples. In this case, we have two samples (men and women) and we want to compare their proportions of preference for Pepsi. Therefore, the Z test for difference in proportions is the most appropriate choice. The other options, such as McNemar test (used for paired samples), paired t test (used for continuous data from paired samples), and Wilcoxon rank-sum test (used for non-parametric data and two independent samples), are not appropriate for this type of analysis.

A Few Years Ago, Pepsi Invited Consumers to Take the "Pepsi