Is the level of gang presence in a school associated with the level of mental health symptoms students at the school exhibit?" What research design will you use to answer your research question? What threats to internal validity does your design rule out and why? What threats to internal validity remain and why? If you were to find a correlation between your independent and dependent variables, what rival hypotheses would you need to rule out before you would consider making a causal claim? What is your unit of analysis? What sampling method will you use to gather elements? What are the strengths and weaknesses of this sampling method? Will the results of your study be generalizable? What limitations are there on generalizability based on your sample