Spearman inferred the existence of a g factor in intelligence from what evidence?
A)Mean performance on IQ tests has been rising from one generation to the next.
B)Scores on any intellectual test correlate positively with almost any other such test.
C)Scores on IQ tests are consistently higher in prosperous countries than in poor countries.
D)Children's scores on IQ tests correlate highly with those of their parents.

Question

Spearman inferred the existence of a g factor in intelligence from what evidence?​
A)Mean performance on IQ tests has been rising from one generation to the next.
B)​Scores on any intellectual test correlate positively with almost any other such test.
C)​Scores on IQ tests are consistently higher in prosperous countries than in poor countries.
D)​Children's scores on IQ tests correlate highly with those of their parents.

Quizplus · Accepted Answer

Spearman inferred the existence of a g factor in intelligence from the positive correlation between scores on different intellectual tests, suggesting that individuals who score well on one type of intellectual test tend to score well on others. This supports the idea that there is a single underlying factor, or g factor, that contributes to performance on all of these tests.

Spearman Inferred the Existence of a G Factor in Intelligence