Which statement accurately describes research about American children’s first exposure to media in their family household?
a) Nearly 95% of American families wait until a child is 2½ years of age before exposing them to DVDs or videotapes.
b) Approximately 75% had used a computer by 3½ years of age.
c) About 43% had played a game on a console by 2 years and 11 months of age.
d) Approximately 44% had played a game on a handheld device by 3 years and 11 months of age.
Answer: d
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Which of the following is the period of time after orgasm during which a man cannot be restimulated to orgasm?
a. Ejaculatory inevitability b. Pre-ejaculation c. Ejaculatory resolution d. Refractory stage
Motor units that include Type IIb fibers a. usually include Type IIa fibers as well
b. produce about 100 times the force as units that include Type I fibers. c. produce about one-third of the force produced by units that include Type IIa fibers. d. are rarely found in humans.
Betty was initially taking a psychoactive drug to help her lose weight and stay awake in class. Unfortunately, she has begun to experience restlessness and sleeplessness. Betty is experiencing the effects of prolonged use of
A. caffeine. B. cocaine. C. an amphetamine. D. opium.
Langer and colleagues found that by providing sixth-grade students with trainingin which
they envisioned the challenges facing people with disabilities, the students were subsequently a. more likely to associate with disabled persons. b. less likely to associate with disabled persons. c. unchanged in their likelihood of associating with disabled persons. d. at first reluctant, but then willing to associate with disabled persons. e. at first willing, but then reluctant to associate with disabled persons.