Is evidence of adverse impact sufficient to prove discrimination?
The 4/5ths rule of thumb speaks only to the question of adverse impact, and is not intended to resolve the ultimate question of unlawful discrimination. Regardless of the amount of difference in selection rates, unlawful discrimination may be present, and may be demonstrated through appropriate evidence. The 4/5ths rule merely establishes a numerical basis for drawing an initial inference and for requiring additional information or review.
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