To assess whether intelligence is a single trait or a collection of several distinct abilities,psychologists have made extensive use of

A) the normal curve.
B) the Flynn effect.
C) standardization.
D) factor analysis.

Factor Analysis

A statistical method used to describe variability among observed, correlated variables in terms of a potentially lower number of unobserved variables called factors.

Flynn Effect

The observed rise over time in standardized intelligence test scores, attributed to various factors such as improved nutrition, education, and environment.

Standardization

Defining meaningful scores by comparison with the performance of a pretested group.