The 80%, or four-fifths rule, is a guideline the courts have used

Name: The 80%, or four-fifths rule, is a guideline the courts have used
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The 80%, or four-fifths rule, is a guideline used to label a test item as biased if there is a four-fifths or 80% difference in passing rates between different groups of test-takers (e.g. based on race or gender). It is not used to determine which population a measure is appropriate for, nor to ascertain the number of passing grades for criterion measurements.

The 80%, or Four-Fifths Rule, Is a Guideline the Courts