IQ score, age, weight, grade point average, and income are all examples of
a. constants.
b. variables.
c. correlations.
d. statistics.
B
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Which area of the brain associated with attention and concentration is completely myelinated by the time a child is about age 5?
A. corpus callosum B. cerebral cortex C. cerebellum D. reticular formation
Prolonged use of amphetamines has been linked to an increase in violent behavior, but it is not easy to interpret this link because
a. there are many different definitions of violence. b. people are usually not willing to admit that they have taken amphetamines. c. the violence could be due to a drug user's lifestyle, not the drug itself. d. very few people actually engage in prolonged use of amphetamines.
A familial association study is used to determine
a. the degree of environmental similarity between twins raised apart. b. the extent to which adopted children share the same characteristics as their adoptive parents. c. the extent to which the same disorders or traits are shared among family members. d. the extent to which family members have different traits or characteristics. e. the extent to which family members participate in shared activities.
Researchers on a college campus conduct an epidemiological study regarding criminal activity. They interview students about their personal histories of criminal activity, and the students underestimate the amount of criminal activity in which they have participated. This inaccuracy is probably due to
a. retrospective reporting. b. social desirability. c. either of the above d. neither of the above