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The quickest way to study changes over the life span is through cross-sectional research. Cross-sectional studies (also known as Cross-sectional analysis) form a class of research methods that involve observation of some subset of a population of items all at the same time, in which, groups can be compared at different ages with respect of independent variables, such as IQ and memory ...

Source: en.wikipedia.org/wiki/Cross-sectional_research

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Q: What is the quickest way to study changes over the life span?
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