In a __________, each member of a population has an equal chance of being selected to participate
a. random sample c. stratified sample
b. selection sample d. free sample
A
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Colleen expects to live until age 80, so she feels that there's no need to have babies for a very long time. Tyler, though, only expects to live to age 25, so he wants to have babies as soon as possible. What is the core influence on Colleen and Tyler's ideas about reproduction?
a. Plasticity b. Biological threshold c. Life expectancy d. Continuity
Which statement best explains why males can grow breasts under certain hormonal conditions?
a. Sex-linked genes become activated b. The Y chromosome becomes activated. c. Sex-limited genes become activated. d. Breast growth is linked to color vision deficiency.
Dementia is associated with brain deterioration brought on by
a. long-term generalized anxiety disorder. b. circulatory problems, stroke, or brain atrophy. c. a conversion disorder. d. lead or mercury poisoning.
In 2011, it was estimated that the total number of people afflicted with HIV, the human immunodeficiency virus, was estimated at
A. 13 million. B. 23 million. C. 34 million. D. 43 million.