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 researcher were clearly using a

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The researchers were studying the same group of children over a long period of time, which indicates the use of a longitudinal study. A cross-sectional study involves testing different age groups at the same time, and a correlation coefficient and regression toward the mean are statistical methods, not study designs.

To Compare Verbal Intelligence at Different Age Levels, Researchers Tested