Example 22:

In large samples of 64-73 year-old smokers (Ns =100,000) and non-smokers (N ns =100,000), 10,000 smokers and 100 non-smokers were diagnosed with lung cancer.

a) What is the relative risk of smoking on lung cancer? Be sure to give the appropriate probabilistic expressions for each number that factors into your calculation.

b)Explain in words what the relative risk of smoking on lung cancer

means? Are smoking and lung cancer independent? Why or why not?