Question

Which evidence best demonstrates an environmental impact on intelligence?

a. A high correlation between the IQ scores of identical twins
b. A low correlation between the IQ scores of strangers
c. The rapid increase in average WISC scores seen during the past 25 years
d. The stability of WISC scores seen during the past 25 years

Answer 1

The rapid increase in average WISC scores seen during the past 25 years is the best evidence of an environmental impact on intelligence.

Step-by-step explanation:

The best evidence that demonstrates an environmental impact on intelligence is c. The rapid increase in average WISC scores seen during the past 25 years.

Intelligence is a complex trait influenced by both genetic and environmental factors. While genetics play a role in determining intelligence, the environment in which an individual is raised also has a significant impact. The rapid increase in average WISC scores over the past 25 years suggests that environmental factors, such as improved education and access to resources, are contributing to the improvement in intelligence scores.