Repeatedly assessing the intelligence of the same group of people at different times across their life span best illustrates a

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Longitudinal study involves repeatedly assessing the same group of people at different times across their life span. This type of study allows researchers to observe and analyze changes that occur over time, making it particularly useful for studying developmental changes in intelligence. Factor analysis involves identifying clusters of related factors, cross-sectional studies compare different age groups at the same time, and heritability index measures the degree to which genetic factors contribute to individual differences in a particular trait or behavior.

Repeatedly Assessing the Intelligence of the Same Group of People