Reply #3 by backlinktalk
Editorial follow-up: a simple dependence example
Imagine event A means a fair die shows an even number and event B means it shows six. Each event has its own probability, but they are not independent: whenever B occurs, A occurs too. Their joint probability is 1/6, not 1/2 multiplied by 1/6. Real sporting relationships are more complicated, which is why assuming independence needs justification.