Children of different age groups were asked to complete the WISC so that researchers could compare the performance of younger and older children.The procedure used in this research best illustrates:

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The procedure used in this research, where children of different age groups were asked to complete the WISC to compare their performances, best illustrates a cross-sectional study. Cross-sectional studies involve comparing data from different groups or individuals at the same point in time, such as measuring the intelligence levels of individuals at different age groups at the same time. In contrast, factor analysis involves identifying underlying factors that may explain patterns in data, longitudinal studies involve following a single group or individual over a period of time, and correlational studies involve examining the relationship between two or more variables.

Children of Different Age Groups Were Asked to Complete the WISC