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.The test statistic is ______.
Definitions:
Compound Sentence
Sentence with two main clauses that express two or more independent but related thoughts of equal importance, usually joined by a conjunction such as and, but, or or.
Complex Sentence
A sentence that contains one independent clause and at least one dependent clause, adding depth to the written communication.
Dependent Clause
A group of words that contains a subject and a verb but does not express a complete thought and cannot stand alone as a sentence.
Connotative Words
Words that carry beyond their literal meaning, evoking emotions, associations, or ideas in the reader or listener.
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