I don’t even know if the question is well written but this is my doubt: sometimes (in the area of medicine in my case) you can read numbers like “between 30 and 80 percent of the patients have a relapse”.
Isn’t a percentage an average per se?
If I do an experiment with 100 people, shouldn’t I have an exact percentage of people who react in certain way? How can’t I know if they are 30 or 80?
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There may be two separate sets of data being combined:
one of know participants who take the drug,
and a second set of patients who are checked to be on the test.
And if the study is anonymous then there could be significant overlap.
So 100 people try the drug. 30 relapse. 20 relapse later. 10 later. And 10 later.
Did 80 people relapse, or did 30 relapse and 10 of them were really bad?
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