Which statement is correct about the prevalence of autism spectrum disorder?
a. It is more common among the lower socioeconomic classes.
b. It is more common among European Americans than among Asian Americans.
c. It is more common among boys than among girls.
d. Around one percent of children in the United States are born with autism.
C
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Plomin's review of the literature on IQ led him to conclude that a person's IQ is about ______ percent the result of genetic factors and about ______ percent the result of environmental factors
a. 90; 10 c. 50; 50 b. 70; 30 d. 30; 70
Your parents are concerned because your younger sister, who just turned 18 years old, told them that she is sexually active. What would you tell them?
a. Her behavior is very uncommon, only 10% of adolescents have had sexual intercourse before age 18. b. Her behavior is fairly uncommon, only 25% of adolescents have had sexual intercourse before age 18. c. Her behavior is fairly common in that 50% of adolescents have had sexual intercourse before age 18. d. Her behavior is very common in that 80% of adolescents have had sexual intercourse before age 18.