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)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 we want to compare two proportions and see if they are significantly different. In this case, we want to compare the proportion of men and women who prefer Pepsi, which makes the Z test the appropriate choice. The McNemar test and paired t test are both used when we have paired data, which is not the case here. The Wilcoxon rank sum test is used when we have two independent groups and want to test if there is a significant difference between them, but in this case we are interested in comparing two proportions.

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