Charles Spearman's belief that there is a factor of general intelligence underlying all intelligent performance was based on his finding that
a. the performance of individuals on a variety of intelligence tests was highly correlated.
b. each individual domain has associated with it specific skills.
c. a person's performance on tests depended both on general intelligence and domain-specific abilities.
d. fluid intelligence and crystallized intelligence were relatively independent.
Answer: a. the performance of individuals on a variety of intelligence tests was highly correlated.
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