\Researchers measured the sugared-beverage consumption and obesity of the same children for two years. They found that when these children added one sugared drink a day to their diet, their risk of obesity increased 60%. Which quasi-experimental design did they use

Longitudinal design

Explanation:

There are different types of quasi experimental design in research & experimental psychology.

However, in this case the answer will be longitudinal research design because the same children were studied for 2 years. And this corresponds to longitudinal design which is a study that is aimed at same individual or same group of people over a period of time.

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