Scientists would like to conduct a study to identify lifestyle factors that are associated with delayed physical growth among a group of low-income American children. Which of the following research designs would be the best for the researchers to use when designing their study?

Epidemiological.

Explanation:

Epidemiological study may be defined as the type of study that includes the different group of the human population to understand the factors that might affects the health.

This study also explains the risk of a particular factor in the population. In the given question, the study is done to understand the relationship between the delayed physical growth and low-income. This clearly explains the epidemological study and this study also have proper design to study the population in cohort.

Thus, the answer is epidemiological.

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