Which of the three measures of fluid intelligence decline steeply throughout adulthood?

By the age of 15, some ________ of teenage boys report that they have masturbated

A) 50% B) 90% C) 80% D) 20%

What is the Flynn effect?

a. The phenomenon of average IQ scores increasing in every racial group except African Americans since the 19 th century b. The phenomenon of average IQ scores increasing in every racial group since the 19 th century c. The phenomenon of average IQ scores staying constant in every racial group since the 19 th century d. The phenomenon of average IQ scores decreasing in every racial group since the 19 th century