Randy, a community psychologist, is working with a community AIDS organization on a project to help reduce HIV transmission. He decides to gather as much information from as many people as possible about their sexual behavior patterns. Which of the following research methods would be the best choice for him to use?

To meet the DSM-5 criteria for PTSD, an individual must not only experience a traumatic event, but he must also

a. exhibit the presence of one (or more) intrusion symptoms associated with that traumatic event. b. experience an inability to recall the event. c. suffer depression and substance abuse. d. maintain a belief that he was responsible for the event.

Heritability generally runs about ____ percent or a tad more for each of the big five trait dimensions.

A) 25 B) 50 C) 75 D) 90