One of the simplest research questions that can be asked is whether two variables are associated. For example: Is medical treatment seeking associated with socio-economic status? Is water fluorination associated with number of cavities during dentist visits? Is alcohol use in adolescence associated with diagnosed mental health conditions in young adulthood?

It seems like you haven't asked a specific question. However, I can guide you on how to determine if two variables are associated based on your examples.

1. Formulate a hypothesis: For example, "Individuals with higher socio-economic status are more likely to seek medical treatment."

2. Collect data: This could involve conducting surveys or interviews, or using existing data sources. The data should include information on both the independent variable (socio-economic status) and the dependent variable (medical treatment seeking).

3. Analyze the data: Use statistical methods to determine if there is a significant association between the two variables. This could involve conducting a correlation analysis, a t-test, a chi-square test, or another appropriate statistical test.

4. Interpret the results: If the statistical test shows a significant association, this supports your hypothesis. However, it's important to remember that correlation does not imply causation – just because two variables are associated does not mean that one causes the other.

5. Report your findings: This could involve writing a research paper, presenting at a conference, or sharing your results in another appropriate format.

You would follow similar steps for the other research questions you mentioned.