To find out if intelligence was a single general ability,Charles Spearman measured how well school-age children could discriminate small differences in colour,auditory pitch,and weight;subsequently,he correlated these scores with the children's:

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Spearman's correlation analysis revealed a positive correlation between the children's scores on different discrimination tasks and their academic performance. This led him to propose that intelligence is a single general ability, which he called "g" or the "general factor." Therefore, the correlation with academic performance is the most relevant choice. The other options are not directly related to Spearman's study or his theory of intelligence.

To Find Out If Intelligence Was a Single General Ability,Charles