Cortisol and cortisone are ______

Older adults who are most likely to experience sleep problems including insufficient deep sleep are

women and coffee drinkers. smokers and older men. people who take naps during the day. people over the age of 80.

Which of the following would be considered a good example of a representative sample of college students in the United States?

a. All the students from a particular rural college b. Every male student from three colleges in Texas c. A diverse population in both urban and rural college classrooms in several states d. Self-identified student volunteers who found your survey on the Internet