TABLE 10-9
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. Below are the results of analyses comparing the taste preferences of men and women with the proportions depicting preference for Pepsi.

-Referring to Table 10-9, suppose Pepsi wanted to test to determine if the males preferred Pepsi more than the females. Using the test statistic given, compute the appropriate p-value for the test.
A) 0.0171
B) 0.0340
C) 0.2119
D) 0.4681

Question

TABLE 10-9
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. Below are the results of analyses comparing the taste preferences of men and women with the proportions depicting preference for Pepsi.
 
-Referring to Table 10-9, suppose Pepsi wanted to test to determine if the males preferred Pepsi more than the females. Using the test statistic given, compute the appropriate p-value for the test.
A) 0.0171 
B) 0.0340 
C) 0.2119 
D) 0.4681

Quizplus · Accepted Answer

Since this is a two-tailed test, we need to multiply the given test statistic (z = 2.24) by 2 to get the absolute value of the test statistic. This gives us 4.48. Looking up 4.48 in the z-table, we find a two-tailed p-value of 0.0171. Therefore, the appropriate p-value for the test is 0.0171. A is the only choice that matches this result.

TABLE 10-9 a Few Years Ago, Pepsi Invited Consumers to Take the Take