A Researcher Wants to Determine Whether the Means of Two

Multiple Choice

A researcher wants to determine whether the means of two independent populations are the same.She has two independent random samples,one from each population,shown in the following table: She uses the Mann-Whitney U test and a significance level of 0.05.Then σ_U is ______.

A) 10.055
B) 11.025
C) 11.255
D) 12.025
E) 12.255