What are the most common mistakes students make in Sets & Statistics?
elements in both sets get counted twice, so you must subtract the intersection: n(A∪B) = n(A)+n(B)−n(A∩B).
Top mistakes to avoid in Sets & Statistics: • elements in both sets get counted twice, so you must subtract the intersection: n(A∪B) = n(A)+n(B)−n(A∩B). • adding the two group sizes and forgetting to remove the overlap. • thinking two data sets with the same mean must be alike.
Common mistake
elements in both sets get counted twice, so you must subtract the intersection: n(A∪B) = n(A)+n(B)−n(A∩B).
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