A difficulty in studying residential treatment programs for drug abuse is that

A difficulty in studying residential treatment programs for drug abuse is that
 
  a) most residences are secretive and unwilling to allow research activity.
  b) addicts at such settings are not severely addicted.
  c) patients at these settings are voluntary, and therefore these addicts represent a minority of the actual addict population.
  d) the number of patients entering such settings changes slowly, making it difficult to obtain an adequate number of participants.

Question 2

Approximately how much of the sleep of an adult is spent in stage 2 sleep?
 
  a) 10
  b) 25
  c) 50
  d) 75

Question 3

Alzheimer's disease is the result of
 
  a) age-based slowing of all bodily processes.
  b) low social and intellectual stimulation.
  c) tangled abnormal protein filaments called neurofibrillary tangles.
  d) side-effects of long-term medication, such as anti-Parkinson's medication.

Question 4

Which of the following cases of depression is most representative of
  those for which genetic factors seem to play an especially great role?
 
  a) Alan who sleeps more than average
   b) Cara whose depression began early in life
   c) Agnes whose diagnosis is of a less severe form of depression
   d) Dave whose depressive symptoms do not respond to medication

Question 5

Which of these individuals falls within the age range of women who are at highest risk for a first episode of depression?
 
  a) Sally, who is 15 years old
   b) Mary, who is 24 years old
   c) Barbara, who is 45 years old
   d) Theresa, who is 55 years old

Question 6

Which of these individuals falls within the age range of men who are
  at greatest risk for a first episode of depression?
 
  a) Al, who is 21 years old
   b) Edward, who is 29 years old
   c) Randolph, who is 45 years old
   d) Salvatore, who is 65 years old