Suppose psychologists find that redheaded people get a lower mean score on some IQ test than do other people. What can we conclude about the possible bias of this test, or what additional information would we need before drawing a conclusion?

Question

Quizplus · Accepted Answer

The fact that redheaded people get a lower mean score on the IQ test does not necessarily mean that the test is biased against them. There could be various other factors affecting their performance on the test, such as socio-economic status, education level, or cultural background. To determine whether the test is biased, we need to test whether redheaded people do better or worse than their test scores predict based on these other factors.

Suppose Psychologists Find That Redheaded People Get a Lower Mean