In a normal approximation to the Wilcoxon rank sum test,the standardized test statistic value is calculated as z = 1.80.For a two- tail test,the p-value is:
A) 0.0359.
B) 0.4641.
C) 0.2321.
D) 0.0718.
E) 0.1077.

Question

Quizplus · Accepted Answer

For a two-tail test, the p-value can be calculated as P(Z ≥ z) + P(Z ≤ -z), where z is the standardized test statistic value.

Using a normal distribution table or calculator, we find that P(Z ≥ 1.80) = 0.0359 and P(Z ≤ -1.80) = 0.0359.

Therefore, the p-value for the test is P(Z ≥ z) + P(Z ≤ -z) = 0.0359 + 0.0359 = 0.0718.

Thus, the best choice is D.

In a Normal Approximation to the Wilcoxon Rank Sum Test,the