Among developed countries, the United States has the highest rate of preschool participation, in programs across the country that are of uniformly high quality.

Dunphy's (1963) classic study examining the transition from same-sex peer groups to other-sex dating relationships found that

A) most early adolescents chose to spend time with individuals outside of their crowd. B) individuals only date within their crowd in late adolescence. C) cross-sex interactions during early adolescence occurred among individuals in cliques. D) lower-status crowd members often begin dating before individuals with higher-status.

In a study by Dutton and Aron (1974), they had a young woman introduce herself to participants either when they were on a high, swinging suspension bridge (high arousal) or when they were on a low, stable bridge (low arousal)

Participants later had to rate the attractiveness of the young woman. The results of this study were consistent with the Schacter-Singer theory. Given this information, which of the following statements is true? a) Participants in the high arousal condition rated the young woman as significantly less attractive than did the individuals who were in the low arousal condition. b) Participants in the high arousal condition rated the young woman as significantly more attractive than did the individuals who were in the low arousal condition. c) Only the participants who had a fear of heights in the high arousal condition rated the woman as significantly more attractive. d) Participants in the high arousal condition rated the young woman as more attractive than did the individuals in the low arousal condition, but the difference was not significant.