Study design
What each study design question is really asking, how to structure the answer, and where the marks are likely to sit.
A planning guide for BIO 550 Week 4 Discussion on the key feature of a cross-sectional study and its strengths and weaknesses. The prompt says key feature in the singular, and the singular is a clue worth following.
Evaluating an intervention you are deliberately introducing is an interventional question, and in a real practice setting that almost always means a quasi-experimental design — which has specific, nameable weaknesses.
Describe the difference between models and theories and say where a researcher's underlying model or theory appears in an article, then find a peer-reviewed primary research article relevant to public health, name its field, state its underlying theory or model, and explain why its methodological approach was chosen.