To compare moral reasoning skills of younger and older children,Professor Hyun tested and retested a group of children from the time they were 4 until they reached the age of 12.The professor conducted a ________ study.

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A longitudinal study is a research design that involves repeated observations of the same variables (such as moral reasoning skills in this case) over a long period of time (from 4 to 12 years old, in this case). This enables the researcher to study how these variables change over time and to examine developmental trends.

To Compare Moral Reasoning Skills of Younger and Older Children,Professor