What is the most appropriate research question that can be answered using RCT? The relationship between:

What is the most appropriate research question that can be answered using RCT? The relationship between:

What is the most appropriate research question that can be answered using RCT? The relationship between:

At the end of HAS 251 you want to investigate the reasons why some students passed and others failed. You have a feeling it is because they didn’t eat chocolate before the final exam. You select 40 students who passed and 40 who failed and administer a questionnaire to find out whether chocolate was eaten before the final exam. What is the study design that best describes this study?

A study investigated the relationship between anxiety and weekly exercise. 100 cases with anxiety diagnosed from 2007–2017 between the ages of 30-60 years and 110 non-blood relatives as controls were interviewed about weekly exercise and other potentially aetiological variables (confounders). If the OR is (odds ratio (OR)=1.5, 95% confidence interval (CI)=0.9, 2.3). What does this mean?