Suppose a Research Uses the Mann-Whitney U Test to Determine

Multiple Choice

Suppose a research uses the Mann-Whitney U test to determine if there is a difference in the volume of text messages sent by a high school student living in a rural area versus an urban area during the month of December.Eight rural high school students and 9 urban high school students were included in the study.If, among all 17, the sum of the ranks W₂ produced from the urban high school is 88, the U₂ test statistic is _____________

A) 29
B) 45
C) 90
D) 43
E) 20