The research that The Bell Curve by Hernstein and Murray was based on is considered flawed by many because

Question

Quizplus · Accepted Answer

The research included fraternal twins raised in different social environments, but found that those raised in similar environments were more similar. This suggests that environmental factors played a significant role in the results and calls into question the genetic basis of intelligence. The other options are not necessarily true; the study did include some identical twins, it included twins of different races and ethnicities, and not all participants were white and middle-class.

The Research That the Bell Curve by Hernstein and Murray