Unit 5 Venn Diagrams

P(A)

probability that the chosen is part of group A

P(B)

probability that the chosen is part of group B

P(A n B)

probability that the chosen is part of both groups —> overlap between circles

P(A u B)

probability of everything —> “all in a bucket”

P(A’)

probability that they are NOT in group A

P(A n B’)

probability of everything OTHER THAN the overlap

P(A u B)’

everything EXPECT group A AND B

P(A/B) = P(A n B) / P(B)

probability of group B given that its group A

Graph independent or not? —> P(A n B) = P(A) . P(B)

independent if individual probabilities multiplied equaled the probability of the overlap (n)