In a normal approximation to the Wilcoxon rank sum test, the standardised test statistic 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.

Question

Quizplus · Accepted Answer

The p-value for a two-tailed test is calculated as 2 times the probability of the standard normal distribution being greater than the absolute value of the test statistic. For z = 1.80, the one-tailed p-value is approximately 0.0359, so the two-tailed p-value is 2 * 0.0359 = 0.0718.

In a Normal Approximation to the Wilcoxon Rank Sum Test