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I'll get back to this in the morning
Mr. Eli Shun’s study that consists of assessing children of different ages at the same time is an example of a cross-sectional research design.
In social science and medical research, a cross-sectional research design is a kind of inspection study that inspects data from a community at a certain point in-time (cross-sectional data).
I'm on this question as well. While I can't answer it all the way, I do have one paragraph already written
http://puu.sh/vVhrN/15accb5937.png
Answer: It is simply due to the fact that no man is an island
Explanation:
