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)Kruskal-Wallis rank Test.
B)Paired t test.
C)Z test for difference in proportions.
D)Wilcoxon rank sum test.

Question

Quizplus · Accepted Answer

Since we are comparing the percentages of men and women who prefer Pepsi, we need to use a test for the difference in proportions. The Z test for difference in proportions is appropriate when we have two independent groups (in this case, men and women) and we want to compare their proportions on a categorical variable (in this case, preference for Pepsi). The other three tests listed are not appropriate for this type of data.

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