Chapter 15

Question 1

general addition rule

Answer 1

for any two events, A and B, the probability of A or B is P(A or B)= P(A) + P(B)-P(A and B)

Question 2

conditional probability

Answer 2

P(B/A)= P(A and B)/ P(A)

*P(B/A) is read “the probability of B given A)

Question 3

general multiplication rule

Answer 3

for any two events, A and B, the probability of A and B is P(A or B)= P(A) X P(B/A).

Question 4

Independence (used formally)

Answer 4

events A and B are independent when P(B/A)= P(B)

Question 5

tree diagram

Answer 5

a display of conditional events or probabilities that is helpful in thinking through conditioning.