Over the last two centuries, children have tended to reach their adult height earlier and are taller than their ancestors. What is the name for this type of phenomenon?
secular trend
evolution
genetic predisposition
generational trend
secular trend
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Yao has an extra X chromosome. He is tall, sterile, and has enlarged breasts. Yao would be most accurately diagnosed as having
a. Tay-Sachs. b. PKU. c. Klinefelter syndrome. d. Turner syndrome.
Traditionally, when researchers are interested in whether some measured difference is different from zero they employ _______.
a. significance tests b. confidence tests c. matched samples procedure d. distributed samples procedure
Which of the following is true about HIV infection?
a. as of 2007, only homosexual men are at risk for this infection b. the only persons who can be infected with HIV are women, children, and men c. one cannot be infected with HIV if one has sex with an infected person only once d. HIV is now a disease that is manageable without risk of undesirable side effects of thetreatment e. HIV is mainly a problem for the economically advantaged
Overall, most American adolescents:
a. will die before reaching middle adulthood. b. are healthy. c. will suffer from at least one serious infectious disease. d. will contemplate suicide.