Although National Survey on Drug Use and Health data indicates greater prevalence of illicit drug use among white Americans, black Americans represented more than 80 percent of those arrested for

Professor Golder is studying hyperactivity in preschool-age children. She is concerned that differences in child rearing, diet, and so forth may affect her results

To minimize these potential preexisting variables, she should be sure to do which of the following? A) Use random assignment when forming her groups. B) Include an independent variable. C) Include a dependent variable. D) Assign boys to the experimental group and

Our brain contains nerves and __________

a. neurons. b. synapse c. ganglia d. all of the above