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 the appropriate test to determine if there is a significant difference in the preference for Pepsi based on gender. This test is used to compare the proportions of two independent groups and can be used for binary data like "preference for Pepsi." The McNemar test is used when the data is paired, and the Wilcoxon rank sum test is used when the data is non-parametric. Therefore, neither of these tests is appropriate for this scenario.

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