In some experiments, participants in the ____________________ group receive a placebo, which is an inactive "sugar" pill that looks just like the drug used in the experimental condition

The measure known as the intelligence quotient was introduced by

a. Binet. b. Terman. c. Wechsler. d. Stern. e. Pearson.

If intelligence was determined primarily by heredity, which pair should show the highest correlation between IQ scores?

a) fraternal twins b) identical twins c) brothers and sisters d) parents and children