Why would a researcher want to ensure that every person in the larger group of study has an equal chance of being included in the sample?
a. This helps eliminate a correlational relationship.
b. It increases the chances of finding a causal relationship.
c. It provides important epidemiological information such as the prevalence and incidence of the disorder.
d. It increases the researcher's ability to generalize findings to the larger group.
d. It increases the researcher's ability to generalize findings to the larger group.
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The findings from twin studies indicate that identical twins are much more similar than fraternal twins on which of the following?
a. neuroticism b. extraversion c. conscientiousness d. All of the above.
Humans begin their existence as a single undifferentiated cell and proceed to become a highly complex and organized billion-cell organism. This change best exemplifies the _____ principle
a. orthogenetic b. proximodistal c. cephalocaudal d. reality
In human development, this layer develops into most of the internal organs.
A. the endoderm B. the mesoderm C. the ectoderm D. the blastoderm
In a(n) ______, twins who have been raised apart are investigated to disentangle the genetic and environmental influences on development.
a. adoption study b. longitudinal design c. nature and nurture study d. linkage analysis