In addition to measuring the Body Concern of the participants who joined a fraternity/sorority both immediately before and immediately after they join, Dr. Fletcher measures them for the 3 weeks before and the 3 weeks after. This type of design is known as a(n)

Interrupted time-series design

Explanation:

In scientific studies, this design is known as an Interrupted time-series design. Basically, it is when a researcher analyses a long-term period before and after an interruption for whatever reason in order to determine the extent to which the interruption/intervention affected the results of the study. In this experiment, Dr.Fletcher is examining the results between a span of 6 weeks from the point of joining the fraternity/sorority.

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most cajuns resided in acadiana, where their descendants are still predominant