By age ____, illness and disease overtake accidents as the leading

A psychologist measures the IQs of 20 students who ingested a "smart pill" and 20 students who ingested a "sugar pill" in order to determine if the pill had an effect on intelligence. To ensure peak performance, she tests all of the students on Wednesdays. In this experiment, the independent variable is the

a. day of the week. b. pill type. c. IQ score. d. sex of the researcher.

Kohlberg used the label ____ when referring to the first level of moral reasoning

a. preoperational b. prepositional c. preconventional d. prepubertal