Suppose a research uses the Mann-Whitney 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 U test statistic is _____________ A) 29 B) 45 C) 90 D) 43 E) 20

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Quizplus · Accepted Answer

The U test statistic is calculated using the formula U = n1*n2 + (n2*(n2+1))/2 - W2, where n1 and n2 are the sample sizes of the two groups. Here, n1 = 8, n2 = 9, and W2 = 88. Plugging in these values gives U = 8*9 + (9*10)/2 - 88 = 72 + 45 - 88 = 29.

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