Jack conducts a study on drinking habits among college students. Since there are too
many college students for him to directly observe all of them, he randomly selects a
group of 250 college students to represent all college students.
Jack's study finds
that 90 percent of college students drink regularly, and 10 percent of those who drink will
eventually become alcoholics. In this study, the 250 people that Jack actually observes
represent the research _______.
a. cluster c. population
b. set d. sample
D
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Seasonal depressions are related to more melatonin being secreted by which endocrine gland during the winter?
a. adrenal b. pineal c. pituitary d. thyroid
In which stage of Piaget's theory of moral development are children are generally unaware of rules as being cooperative agreements?
a. the stage of moral realism c. the premoral stage b. the stage of moral relativism d. the stage of moral absolutism
Approximately ____ of the nation's adolescents has at least one serious health problem
a. 1 percent c. 10 percent b. 5 percent d. 18 percent
Some studies indicate that ________ may protect the brain from the effects of stress.
A. cellular migration B. synaptic pruning C. increased levels of neurotrophins D. neurogenesis