The distribution of the Mann-Whitney statistic,U,approaches the normal distribution quite rapidly as the number of sample observations increases.The approximation is adequate if n₁ ≥ 10 and n₂ ≥ 10.

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This statement is true. As the sample size increases, the Mann-Whitney U statistic approaches a normal distribution, and the approximation is acceptable if the sample sizes are large enough (usually defined as n1U/B ≥ 10 and n2U/B ≥ 10).

The Distribution of the Mann-Whitney Statistic,U,approaches the Normal Distribution Quite