Unit 4. Chapter 15: Probability Rules. AP Statistics. The General Addition Rule. When two events A and B are disjoint, we can use the addition rule for disjoint events from Chapter 14: P (A B) = P (A) + P (B)
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P(A B) = P(A) + P(B)
P(A B) = P(A) + P(B) – P(A B)
Below is a Venn Diagram of a sample of 200 women who like yoga to relieve stress and who like running to relieve stress.
P(A B) =P(A) xP(B)
P(A B) = P(A) P(B|A)
P(A B) = P(B) P(A|B)
P(B|A) = P(B). (Equivalently, events A and B are independent whenever P(A|B) = P(A).)
B = You’re not at home at dinnertime when they call.
B = As a selected subject, you refuse to cooperate.
B = You are employed full time.
P(A B) = P(A) x P(B|A)