To compare verbal intelligence at different age levels,researchers tested and retested a group of children from the time they were 2 until they reached the age of 20.The researchers were clearly using a

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A longitudinal study involves testing participants at different points in time to measure changes or stability in a particular variable. In this case, the researchers tested the same group of children at different ages, which fits the definition of a longitudinal study. Correlation coefficient measures the degree of association between two variables, cross-sectional study compares different groups at one point in time, and regression toward the mean refers to the phenomenon of extreme scores becoming less extreme with repeated measurements.

To Compare Verbal Intelligence at Different Age Levels,researchers Tested and Retested