Reports that examine the buying habits of a group of teenagers at three-month intervals are examples of a longitudinal study.

Question

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A longitudinal study is a research study that follows a specific group of individuals or subjects over an extended period of time, collecting data at various intervals. In this case, the group of teenagers is being followed for buying habits every three months, which fits the definition of a longitudinal study.

Reports That Examine the Buying Habits of a Group of Teenagers