Which of the following is a change that occurs in the brain during the adult years?
A) Slower synaptic speed
B) An increase in gray matter
C) An increase in brain weight
D) A pruning of the synapses to eliminate redundant neural connections
A
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______ samples are more likely to be representative of the population.
A. Probability B. Random C. Quota D. Convenience
In order to estimate the amount of TV watched by New York City adults, a sociologist surveys a random sample of adults from this city. The average (mean) of the raw scores is a _________
a. population c. statistic b. sample d. parameter
Which of the following best explains why visual acuity declines during middle age?
a. The lens of the eye enlarges and becomes less flexible and less transparent. b. The occipital lobe, the area of the brain that controls vision, becomes less efficient. c. The retina of the eye becomes less pliable and malleable, therefore affecting acuity. d. The phenomenon known as binocular vision becomes less efficient and slowly disappears.
According to Cook and Campbell (1979), what are the three types of evidence used to identify the causes of a behavior?
A. alternative explanations, positive linear relationship, and construct validity B. internal consistency reliability, item-total correlation, and covariation of cause and effect C. temporal precedence, covariation of cause and effect, and alternative explanations D. facilitated communication, alternate-forms reliability, and falsifiability