Subjects may be used as their own control when
a. experiencing one condition is unlikely to influence the response to another
b. using statistical control is impossible
c. there are likely to be sequence effects
d. a within-subjects condition is not possible
a
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Medicare is the primary source of income for more retired individuals in the United States.
Answer the following statement true (T) or false (F)
A species of bird develops a mating call to attract mates. This is an example of
A. intrasexual selection. B. intersexual selection. C. intersexual altruism. D. reciprocal altruism.
Participant variables are also called ________ variables.
A. situational B. external C. construct D. subject
Gray matter in the brain ________.
A. replaces white matter during middle childhood B. consists largely of myelinated nerve fibers C. increases steadily throughout childhood and adolescence D. declines as synaptic pruning and death of surrounding neurons proceed