We know that when we are trying to determine whether two events are independent, we ask ourselves if the probability of one event is affected by the other event. For example, suppose you wanted to know the probability that a 27-year old male has suffered a concussion, given he played football in high school and college. Does the fact that he played football change the likelihood that he has had a concussion? If the answer is yes, the two events (suffered a concussion and played football) are not independent. Give an example of two events that are not independent.