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5. You wonder whether the ratings for movies that are dramas differ, on average, from the ratings of movies that are...

5. You wonder whether the ratings for movies that are dramas differ, on average, from the ratings of movies that are comedies. You retrieve the ratings of 5 comedies and 5 dramas from the Internet Movie Database (IMDB). The ΣR for dramas is 25 and for comedies it is 31. What is the value of U for dramas?
= 25 + (25/2) – 25 = 12.5
= 25 + (30/2) – 25 = 15
= 25 + (30/2) – 31 = 9
= 25 + (25/2) – 31 = 18.5
math   Statistics-And-Probability   
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Answer #1

Formula for U is as follows:

Image result for mann whitney u formula

Let 'a' represent Dramas and 'b' represent comedies

In this case na = nb = 5, Ra = 25 and Rb = 31

So, U for Dramas = Ua = 5*5 + 5*(5+1)/2 - 25

U for Dramas = Ua = 25 + 30/2 - 25 = 15 (2ndOption is correct)

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