In a sample of 1,000 presenting a survey from the entire population, 650 people were from Laketown, and the rest of the people were from River City. Out of the sample, 19 people had some form of cancer. Thirteen of these people were from Laketown.
a. Are the events of living in Laketown and having some sort of cancer independent?
b. Which city would you prefer to live in, assuming that your main objective was to avoid having cancer?