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...Prospective studies retrospective cross sectional summary and patrick breheny april introduction to biostatistics study designs that can be analyzed with tests one reason are so popular is they used analyze a wide variety of in addition controlled experiments widely epidemiology where investigators must conduct observational broadly speaking fall into three categories cont d fisher s exact test all these best some might say you don t even need think about your design or data came from if it expressed as x contingency table the always appropriate caveat there lot tables this world have two rows columns does not necessarily make them please try perform on wehave said double blind randomized trial gold standard biomedical research when possible ethical also called cohort next thing collect sample classify individuals way then wait see develop condition classication usually based exposure risk factor such smoking obesity...