“With more than 1,500 observations, the study uncovered substantial, statistically significant race discrimination. Bus drivers were twice as willing to let white testers ride free as black testers (72 percent versus 36 percent of the time). Bus drivers showed some relative favoritism toward testers who shared their own race, but even black drivers still favored white testers over black testers (allowing free rides 83 percent versus 68 percent of the time).
The study also found that racial disparities persisted when the testers wore business attire or dressed in army uniforms. For example, testers wearing army uniforms were allowed to ride free 97 percent of the time if they were white, but only 77 percent of the time if they were black...
Drivers were more likely to let testers ride free when there were fewer people on the bus to observe the transaction. And the drivers themselves were probably not aware that they were treating minorities differently. When drivers, in a questionnaire conducted after the field test, were shown photographs of the testers and asked how they would respond, hypothetically, to a free-ride request, they indicated no statistically significant bias against minorities in the photos (86 percent said they would let the black individual ride free)."
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