In the United States, what percentage of children has no siblings?
a. 5%
b. 10%
c. 15%
d. 20%
Answer: D
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Most psychological attempts to improve sports performance begin with
a. task analysis. b. analysis of coaches. c. analysis of athletes. d. none of these.
Which statement best describes the biological system?
a. All the environmental influences on an individual's health b. All the processes through which a person becomes integrated into society c. All the processes necessary for the physiological functions of an organism d. All the mental processes central to making sense of experiences
The Central Limit theorem states that:
a. if many samples are drawn randomly from a population, their means tend to be normally distributed. b. the means of large samples will be better measures of central tendency than the means of small samples. c. most scores will fall within three standard deviations of the mean. d. the standard error of a distribution is limited by its central tendency.
The development of secondary sexual characteristics:
a. is directly concerned with reproduction. b. provides external signs of the approach of puberty. c. occurs only in boys. d. occurs only in girls.