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 interested 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) paired t test
B) ç2 test for variance
C) Wilcoxon rank sum test
D) Z test for difference in proportions

Question

Quizplus · Accepted Answer

The Z test for difference in proportions is the appropriate test to use in this situation as we are comparing the proportions of preference for Pepsi between two groups (men and women) and the data is categorical. The paired t test is used when we have paired data, while the chi-square test for variance is used when we are comparing variances. The Wilcoxon rank sum test is used when the data is ordinal or non-normally distributed.

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