A psychologist first conducted a study on helping behavior with a sample of college undergraduates. This psychologist then replicated the study using the same procedure with a different participant sample
If similar results were obtained with both samples, this experimenter has demonstrated
a. internal validity.
b. external validity.
c. population consistency.
d. chronological consistency.
Answer: B
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In their study of the heritability of autistic traits among Dutch teens, Rosa Hoekstra and her colleagues were careful to choose participants from a variety of backgrounds and circumstances. Why is careful sampling especially important to studies of heritability?
a. The effects of heritability are most obvious in populations that exclude extreme environmental conditions, such as affluent or very poor families. b. Environmental influences are magnified in extreme environmental conditions, such as among affluent or very poor families. c. Extremes of environmental conditions, such as affluent or very poor families, tend to magnify the influence of heritability. d. These precautions are really not relevant, because heritability cannot be assessed experimentally.
According to the data accumulated by the National Center for Health Statistics, the leading cause of death for late teenagers and early adults in the United States was clearly cancer
Indicate whether the statement is true or false