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Dr. Juan is conducting a study of military veterans from the Vietnam and Gulf wars, in which he plans to evaluate them every year for 10 years to find out if those with PTSD have a more pronounced decline in mental abilities and overall memory over the 10 years. This is a(n) _____________ study.

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Answer: longitudinal.

Explanation:

A longitudinal study is an analysis plan that requires to repeat measurements of the same variables over time, sometimes lasting many years, such as the 10-years in this example.

Longitudinal studies are frequently employed in psychology, to analyze behavioral changes from time to time; in developmental psychology, to examine developmental patterns over the life span; and in sociology, to analyze the life of different lifetimes or generations.

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