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How many Epi questions did you have?
4-5 for me. as stated, answers are in formula form and are very straight forward. don't stress too much. be prepared for "how does lowering the cutoff value affect sensitivity/specificity?" otherwise know the basic formulas and you'll be fine.
yeah. the answers were stock tho, like a) increases sens, increases spec, b) increases sens, decreases spec, etc. so the graph wasn't really required, just the fact that you know what it does.