A random sample consists 10 young and 10 old investors. Their earnings in investment in thousand dollars are as follows:

Use Mann–Whitney U test to decide whether the young investors earn significantly different from the old investors for α = 0.05.

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Young Old Young Old 30 45 43 54 37 48 45 55 41 50 48 58 41 52 48 61 42 52 49 64