To test for age differences in intelligence,at the beginning of the school year a researcher gave the same mathematics test to groups of children who were 8,10,12,and 14 years of age.This procedure best illustrates a

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A cross-sectional study involves testing individuals from different age groups at the same time. This is exactly what the researcher did by giving the same mathematics test to children of different ages at the beginning of the school year. Therefore, the procedure best illustrates a cross-sectional study.

To Test for Age Differences in Intelligence,at the Beginning of the School