An expert estimates that the distribution parameter for durability times of parts produced with machine A in the factory is different from the distribution parameter for durability times of parts produced with machine B. Durability times of 7 parts produced from machine A and 7 parts produced from machine B are given below. Accordingly, find the Mann Whitney U critical table value required to test the expert's claim at a = 0.05 significance level.  a) 12  B) 14  NS) 16  D) 18  TO) 21

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