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
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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.
Erikson's stage that occurs between 3 and 6 years of age is called
initiative versus guilt.
Problems such as depression would be classified as what?
A. Internalizing problems B. Pubertal problems C. Externalizing problems D. Risk behaviors
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%