Which of the following is a valid statement relating to research concerning genetic influence on cognitive abilities?
a. Fraternal twins have higher correlations on scores of cognitive functioning than do monozygotic twins.
b. Different types of cognitive abilities are influenced to the same extent by genetics.
c. For general cognitive ability, heritability decreases with age.
d. Meta-analyses of variance in IQ scores among twins suggest that 50% of the variance can be explained by genetic differences.
D
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Which of the following is an example of a Phase 2 alcohol withdrawal symptom?
a. grand mal seizures b. hallucinations c. shakes d. very high body temperature and abnormally rapid heart beat
Some questions include more than one basic idea and confuse people who might agree with one item, but not the other. Such an item is called ______.
A. reverse scored B. Likert C. double-barreled D. forced choice
Which of the following correctly identifies factors in the risk for progressing from alcohol use to alcohol abuse or addiction?
a) impulsivity, low response to alcohol b) impulsivity, high response to alcohol c) genes alone d) environment alone
The majority of young people in the United States have had sexual intercourse by
A) ninth grade. B) their junior year in college. C) the time they graduate from high school. D) the time they finish grade school.