Haier and his associates found that the brains of people who perform well on mental tests consume less energy than those who perform poorly on these tests

Mr. Dunn is concerned about his 17-year-old daughter, who has been exchanging text messages with one particular boy. You should tell him that

A) this romantic involvement will probably last through college. B) close romantic ties promote sensitivity, empathy, self-esteem, social support, and identity development. C) this relationship is probably interfering with her identity development. D) his daughter is too young for dating and is at risk for drug use and early sexual activity.

A researcher is designing an experiment, and ensures that each participant is equally likely to be in one condition as another. He does not assign them based on any characteristics such as gender, ethnicity, or personality

This researcher is ________ participants. a. randomly assigning b. meta-analyzing c. randomly selecting d. generalizing