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N1=240 N2=260

Also a reference to your answer would be great please!

isuckatmaths
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  • The first duplicate (which was in *Related* in the sidebar and should have been offered to you as a possible answer when you were trying to post) directly responds to your question and includes a reference in comments – Glen_b Apr 16 '17 at 07:48

1 Answers1

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Yes. See: original paper by Mann and Whitney.

Specifically, note the last sentence in their abstract referring to two distinct sample sizes.

Let $x$ and $y$ be two random variables with continuous cumulative distribution functions $f$ and $g$. A statistic $U$ depending on the relative ranks of the $x$'s and $y$'s is proposed for testing the hypothesis $f=g$. Wilcoxon proposed an equivalent test in the Biometrics Bulletin, December, 1945, but gave only a few points of the distribution of his statistic. Under the hypothesis $f=g$ the probability of obtaining a given $U$ in a sample of $n$ $x$'s and $m$ $y$'s is the solution of a certain recurrence relation involving $n$ and $m$. [...]

overdisperse
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