According to Charles Spearman, the intercorrelations among mental tests are not perfect due to __________.

A) variability in age
B) variability in group factors
C) variability in specific factors
D) lack of validity

Intercorrelations

Statistical relationships or connections between three or more variables, indicating how changes in one variable are associated with changes in others.

Specific Factors

Elements or conditions that are unique to a particular situation, problem, or equation, contributing to its outcome or solution.

Charles Spearman

A psychologist known for his work in statistics and intelligence, notably for his theory that a general intelligence factor, "g", underlies all cognitive abilities.