At a single point in time,researchers may test and compare the intelligence of members of different age groups.This bests illustrates a:

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A cross-sectional study compares different groups at a single point in time, which is exactly what is described in the scenario. Longitudinal studies track changes in the same group of individuals over time. Factor analysis is a statistical technique used to identify underlying factors or patterns in data. Fluid intelligence is a type of intelligence that involves problem solving and reasoning, and it is not directly relevant to the scenario described.

At a Single Point in Time,researchers May Test and Compare