Conditional probability

What you'll learn

1. Define conditional probability and interpret the notation P(A|B) as "the probability of A given that B has occurred"
2. Calculate conditional probability using P(A|B) = P(A and B) / P(B)
3. Read conditional probabilities directly from two-way frequency tables by restricting to the appropriate row or column
4. Correctly distinguish between P(A|B) and P(B|A) and explain why they are generally not equal

Prerequisites

• Basic probability of single events