Question

1. _, or _, are controlled studies where some type of “experiment” is used to determine its impact on certain health parameters.

clinical trials, case - control studies
clinical trials, intervention studies
case - control studies, small - scale epidemiological studies
case - control studies, intervention studies

Explanation:

Clinical trials are controlled studies with an experiment - like approach to assess impact on health parameters. Intervention studies also involve an intervention (experiment - like) to study health - related impacts. Case - control studies are observational and not the same as the described experiment - based studies.

Answer:

Clinical trials, intervention studies