Aresearcher studies language development by selecting a sample of 2-year-old children and giving them a language skill test. each year for the next two years, the same children are brought back and tested again. the researcher plans to compare the children's scores at age two, age three, and age four. this study is an example of

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longitudinal developmental design

Explanation:

Longitudinal developmental research design  analyzes progress by observing or measuring a group of people over time. As a consequence, it assesses changes in behavior according  to age over time by examining one group of participants of about the same age.

answer; the above statement is (true);