Suppose that two population proportions are being compared to test whether there is any difference between them. Assume that the test statistic has been calculated to be z = 2.21. Find the p-value for this situation.
A) p-value = 0.0136
B) p-value = 0.4864
C) p-value = 0.0272
D) p-value = 0.9728

Question

Quizplus · Accepted Answer

The p-value for a two-tailed test is found by doubling the area in the tail beyond the z-score in a standard normal distribution. A z-score of 2.21 corresponds to a tail area of approximately 0.0136. Therefore, the p-value for both tails combined is 0.0136 * 2 = 0.0272.

Suppose That Two Population Proportions Are Being Compared to Test