Question: Which type of study involves a researcher comparing IQ and poverty rates among 15-year-olds, 25-year-olds, and 45-year-olds? longitudinal ecological cross-sectional case-control

Which type of study involves a researcher comparing IQ and poverty rates among 15-year-olds, 25-year-olds, and 45-year-olds? longitudinal ecological cross-sectional case-control

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