Adverse impact usually takes place when an employment decision, practice, or policy has a disproportionately negative effect on a protected group. HR professionals rely on the “four-fifths” or “80 percent” rule to judge whether adverse impact may have occurred. Consider the situation for men and for women:

sex	tot applicant	selected applicant	selection rate
female	750	375
male	1050	450
tot	180	825

Calculate (a) the selection rate for females and (b) the selection rate for males.

What is the ratio of the female selection rate to the male selection rate?