Which of these research methods would a psychologist be likely to employ to study the influence of genetics on personality?
A) examining correlations in personality between pairs of identical and fraternal twins
B) interviewing people who have known others who were particularly odd or unique
C) administering paper and pencil or computerized questionnaires to hundreds of people
D) documenting the patterns of development and difficulties of psychiatric patients
Answer: A
Rationale: Because identical and fraternal twins differ primarily in the amount of DNA they share, comparing the correlation in personality between identical twins to fraternal twins can be used to estimate the heritability of personality.
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a. 70 b. 85 c. 115 d. 130
The most important aspect of sampling in a survey study is
a. its inclusion of equal numbers of individuals from different groups in the population. b. the number of people in the sample. c. the ratio of the sample size to the population size. d. the extent to which the sample is representative of the population.