Which of the following results of research studies on children's sleep is true?

A. In 2- to 5-year-old children, each additional hour of daily screen time was associated with a decrease in sleep time.
B. Attention problems in early adolescence were independent of sleep problems in early childhood.
C. In a Chinese study, preschool children who used electronic devices 3 or more hours per day had long sleep durations.
D. Preschool children with a short sleep duration were more likely to have better social skills than others.


Answer: A

Psychology

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Research on 16-year-old sexual abstainers, low risk-takers, and high risk-takers found that

a. abstaining was most common in teens with unwed mothers. b. high-risk teens looked more mature at earlier ages than teens from the other groups. c. low-risk teens were most likely to be involved in romantic relationships. d. there was no relationship between behaviors exhibited between ages 9 and 12 and later sexual activity.

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Erikson's stage that occurs between 3 and 6 years of age is called

initiative versus guilt.

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Problems such as depression would be classified as what?

A. Internalizing problems B. Pubertal problems C. Externalizing problems D. Risk behaviors

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By the time infants in developing countries reach their first birthday, their height and weight is as low as the bottom __________ of infants of the same age in developed countries.

A. 2% B. 5% C. 10% D. 15%

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