Answer:
True
Step-by-step explanation:
The general factor and specific factors can be found from various mental tests, covering different areas of cognitive abilities, where there is a positive correlation between these tests for the same individual.
Charles Spearman, recognized as the founder of the factorial analysis, unleashed in the 1920s and 1930s all work on the theoretical and empirical basis of the psychometric perspective, also known as general factor theory, two factor theory or bi-factorial. According to this theory, intelligence can be understood either by a single general factor underlying performance in all mental abilities tests, or by a set of specific factors, each of which would be involved in performance in only a single type of mental ability test (for example: numerical reasoning).